Search Images Maps Play YouTube News Gmail Drive More »
 Books Books
BXD' 125. A PROPORTION is an equality of ratios. Four magnitudes are in proportion, when the ratio of the first to the second is the same as that of the third to the fourth.
Dictionary of Scientific Terms - Page 261
by P. Austin Nuttall - 1869 - 325 pages

## Mathematics: Compiled from the Best Authors and Intended to be the ..., Volume 1

1801 - 444 pages
...geometrical proportion ; for •£-= '•£ — 2, but \- = 8. Four numbers are directly proportional, when the ratio of the first to the second is the same as that of the third to die fourth. As 2 : 4 : : 3 : 6. Four numbers are said to be recipri*ally or inversely proportional,...

## Mathematics: Compiled from the Best Authors, and Intended to be ..., Volume 1

Samuel Webber - 1808 - 466 pages
...discontinued geometrical proportion ; for | 1T6 =2, but y =8. Four numbers are directly proportional, when the ratio of the first to the second is the same, as that of the third to the fourth. As 2 : 4 : : 3 : 6. Four numbers are said to be reciprocally or inversely proportional, when the first...

## A portable cyclopædia; or, Compendious dictionary of arts and sciences

C T. Watkins - 1810 - 1056 pages
...antecedent. Ь5. Three ma«ni;udes or quantities, Л. B,C,are said to be proportional, wnen the ratio ot the first to the second is the same as that of the second to the third. Thu», ?, 4., 8. зге proportiunal ; because Л is contained in b li many times...

## A System of Arithmetic: Reprinted from the Mathematical Text-book

Samuel Webber - 1812 - 266 pages
...discontinued geometrical proportion ; for £=y=2, but *^=8. Four numbers are directly proportional, when the ratio of the first to the second is the same, as that of the third to the fourth. As 2 : 4 : : 3 : 6. Four numbers are said to be reciprocally, or inversely proportional, when the first...

## A Course of Mathematics: For the Use of Academies as Well as Private Tuition

Charles Hutton - 1812 - 622 pages
...(4), c (8), where .J ;= | = 2, both the same ratio. 79. Four quantities are said to be Proportional, when the ratio of the first to the second, is the same as the ratio cf the third to the fourth. As of the four, A (2), B (4), c (5), D (10), where .* = '.j°—...

## A New and Concise System of Arithmetick: Containing Vulgar, Decimal, and ...

Beriah Stevens - 1822 - 434 pages
...division of the wntecedent 1, by the consequent 2, viz. i. Four numbers are siiid to be proportional when the ratio of the first to the second is the same as that of the tliii'd to the fourth ; and the proportional numbers are usually distinguished from one another, as...

## Elements of Science and Art: Being a Familiar Introduction to ..., Volume 2

John Imison - 1822 - 488 pages
...consequent by the antecedent. 54. Three magnitudes or quantities, A,B,C, are said to be proportional, when the ratio of the first to the second is the same as that of the second to the third. Thus, 2, 4, 8, are proportional, because 4> is contained in 8 as many times as...

## A Course of Mathematics: For the Use of Academies, as Well as Private ...

Charles Hutton - 1822 - 616 pages
...B (4), c (8), where f =f =5, both the same ratio. 79. 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 (2), B (4), c (5), p (10), where 5=»/r=i,...