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单词 rule of three
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rule of three
rule of three n. [compare French la regle de trois (1520)] Mathematics (in a proportion) a method of finding a fourth quantity, given three known quantities, which bears the same relation to the third as the second does to the first, or (equivalently) the same relation to the second as the third does to the first; cf. golden rule n. 1, rule of proportion at proportion n. 9b.When the relation of the fourth (unknown) quantity to the third is the same as that of the second to the first, the rule of three is called common or direct; when the relation of the fourth quantity to the second is the same as that of the third to the first, the rule of three is called inverse (cf. Rule of Three Inverse n. at Phrases 2a(b)).
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the world > relative properties > number > mathematics > [noun] > mathematical enquiry > process of calculating > method or rule for
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algorithm1811
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decision procedure1936
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decision method1940
1562 H. Baker Well Sprynge Sci. i. vii. f. 34v The rule of three is the chiefest, the moste profitable, and the moste excellente rule of all the rules of Arithmetike.
1594 T. Blundeville Exercises i. vi. f. 9v And this is the common kind of working by the Rule of 3. whereof it is called the common Rule of three.
1650 T. Rudd Pract. Geom. ii. 23 This is your first number in the Rule of Three.
1706 W. Jones Synopsis Palmariorum Matheseos 140 When the Rule of Three Direct has 1 for the 1st Term, 'tis usually called the Rule of Practice.
1766 Monthly Rev. 35 48 Having laid down the fundamental rules of arithmetic, our Author proceeds to proportion, or the rule of three.
1828 Moore's Pract. Navigator (ed. 20) p. xv Rule of Three in Decimals is worked in the same manner as common Arithmetic.
1912 Pop. Mech. Oct. 130 This Slide Rule will multiply, divide, solve proportion... Also the mensuration of superficies, and the rule of three.
2004 J. Godwin Real Rule of Four iv. 115 Those familiar with old-fashioned arithmetic will known of the ‘rule of three’.
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