Rule of three

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(Arith.)	that rule which directs, when three terms are given, how to find a fourth, which shall have the same ratio to the third term as the second has to the first; proportion. See Proportion, 5 (b).
(Arith.)	See under Rule, n.

See also: Rule Three

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The world is filled with the proverbs and acts and winkings of a base prudence, which is a devotion to matter, as if we possessed no other faculties than the palate, the nose, the touch, the eye and ear; a prudence which adores the Rule of Three, which never subscribes, which never gives, which seldom lends, and asks but one question of any project,--Will it bake bread?

Essays, First Series by Emerson, Ralph Waldo View in context

As difficult to decipher as a hieroglyphic inscription to the clerks, the vocation of the secretary and his usefulness were as plain as the rule of three to the self-interested.

Bureaucracy by de Balzac, Honore View in context

You can work it out by Fractions or by simple Rule of Three, But the way of Tweedle-dum is not the way of Tweedle-dee.

The Jungle Book by Kipling, Rudyard View in context

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