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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

## Elements of Algebra

James Morford Taylor - 1900 - 504 pages
...16. Which is the greater ratio, 7:5 or 7 + 2:5 + 2? PROPORTION. 324. Four quantities are said to be in proportion when the ratio of the first to the second is equal to the ratio of the third to the fourth. An equality whose members are two equal ratios is called...

## Mathematics

American School (Lansing, Ill.) - 1903 - 426 pages
...lib, — — т = — i Or о : a. aba 4. Proportion is an equality of ratios. Four quantities are in proportion when the ratio of the first to the second is equal to the ratio of the third to the fourth. The equality of two ratios is indicated by the sign...

## A Text-book of Euclid's Elements for the Use of Schools, Book 1

Euclid - 1904 - 488 pages
...number to another is the multiple or fraction which the first is of the second. (ii) Four numbers are in proportion when the ratio of the first to the second is equal to the ratio of the third to the fourth 3. These definitions are however not strictly applicable...

## Handbook of Mathematics for Engineers and Engineering Students

Joseph Claudel - 1906 - 758 pages
...213). RKMARK 2. The word proportion used alone means geometrical proportion. 326. Four quantities are said to be proportional or in proportion when the ratio of the first to the second is equal to the ratio of the third to the fourth. Thus, given the four proportional quantities 8, 4, 12,...

## Appleton's New Practical Cyclopedia: A New Work of Reference Based ..., Volume 5

Marcus Benjamin, Arthur Elmore Bostwick, Gerald Van Casteel, George Jotham Hagar - 1910 - 548 pages
...relation, expressed by division, which one quantity bears to another. Four quantities are said to be in proportion when the ratio of the first to the second is equal to the ratio of the third to the fourth. A proportion may be written in either of two ways; thus...

## An Introduction to Practical Mathematics

Frank Moulton Saxelby - 1910 - 238 pages
...or loss as accurately as your tables will allow. 92. Proportion. — Four quantities are said to be in proportion when the ratio of the first to the second is equal to the ratio of the third to the fourth. Consider (he following geometrical example. Draw any...

## The Principles and Practice of Electric Wiring: For Evening Students

Archibald Bursill - 1911 - 242 pages
...Thus the ratio of a quantity P to a quantity Q may be written — P Four quantities are said to be in proportion when the ratio of the first to the second...the same as the ratio of the third to the fourth. For example, P, Q, R, and S are said to be in proportion when _P _ R QS so that, knowing three of these...

## The Texas Mathematics Teachers' Bulletin, Volumes 1-7

1915 - 832 pages
...equality between two ratios is said to form a proportion, or in other words four quantities are said to be in proportion when the ratio of the first to the second is equal to the ratio of the third to the fourth. Thus 5 ft. \$25 2 ft. \$10 is a proportion. This is often...