rule of three
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noun Mathematics.
the method of finding the fourth term in a proportion when three terms are given.
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Nearby words
rule of eleven, rule of engagement, rule of law, rule of outlet, rule of the road, rule of three, rule of thumb, rule out, rule the roost, ruled surface, ruleless
Origin of rule of three
First recorded in 1585–95
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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British Dictionary definitions for rule of three
rule of three
noun
a mathematical rule asserting that the value of one unknown quantity in a proportion is found by multiplying the denominator of each ratio by the numerator of the other
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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