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Four quantities are said to be proportional when thejatio of the first to the second is the same as the ratio of the third to the fourth.
A Dictionary of Science, Literature, & Art: Comprising the Definitions and ... - Page 113
edited by - 1867

## The University Arithmetic: Embracing the Science of Numbers, and Their ...

Charles Davies - 1846 - 370 pages
...cloth is the 2d term, \$2 is the - 3d term, \$12 is the ... 4th term. Now the ratio of the first term to the second is the same as the ratio of the third to the fourth. This relation between four numbers is called proportion ; and generally Four numbers are said to be...

## Elementary Course of Geometry ...

Charles William Hackley - 1847 - 248 pages
...= 4, C = 8, where \ = £ = \, both the same ratio. 78. Four quantities are said to be proportional when the ratio of the first to the second is the same as the ratio of the third to the fourth. As of the four, A (4), B (2), C (10), D (5), where | = y = 2, both the same ratio. * The antecedent...

## Arithmetic: Designed for Academies and Schools, Uniting the Inductive ...

Charles Davies - 1847 - 368 pages
...This relation between four numbers is called proportion ; and generally, Four numbers are said to be in proportion when the ratio of the first to the second is the same as that of the third to the fourth. Hence, 181. How do you determine what part one number is of another?...

## Arithmetic: Designed for Academies and Schools, Uniting the Inductive ...

Charles Davies - 1847 - 368 pages
...This relation between four numbers is called proportion ; and generally, Four numbers are said to be in proportion when the ratio of the first to the second is the same as that of the third to the fourth. Hence, 181. How do you determine what part one number is of another?...

## An Elemtary Arithmetic ...: Serving as an Introduction to the Higher ...

George Roberts Perkins - 1849 - 346 pages
...between 12 feet and 3 pounds ? Can the ratio be a denominate number 1 How are four quantities related when the ratio of the first to the second is the same as the rntio of tbe third to the fourth .' Which are called extremes ? Which are culled means t To what is...

## Higher Arithmetic: Designed for the Use of High Schools, Academies, and ...

George Roberts Perkins - 1849 - 356 pages
...days, is f . The ratio of 3| hours to 1\ hours, is 3i-^7i=i§. When there are four quantities, of which the ratio of the first to the second is the same as that of the third to the fourth, these four quantities are said to be in proportion. Thus, 4, 6, 8,...

## An Elementary Arithmetic Serving as an Introduction to the Higher Arithmetic

George Roberts Perkins - 1850 - 364 pages
...between 12 feet and 3 pounds ? Con the ratio be s denominate number .' How are four quantities related when the ratio of the first to the second is the same as the ratio of the third to the fourth f Which are called estremes ? Which are called means ? To what is the product of the extremes eqiiall...

## The Speedy Calculator: Being a System of Arithmetic

Benjamin Naylor - 1850 - 334 pages
...65 to 85 it is f |j=i\$. Proportion is equality of ratio. Four numbers are said to be proportionals when the ratio of the first to the second is the same as the ratio of the third to the fourth ; hence, 17, 13, 85, 65, are proportionals. The first and fourth are called the extreme terms, and...