rule of three

noun Mathematics.
the method of finding the fourth term in a proportion when three terms are given.

Origin:
1585–95

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World English Dictionary
rule of three
 
n
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 10th Edition
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Example sentences
If public notice, decide whether to use category ranking or rule of three.
Candidates cannot be eliminated after three considerations as with the rule of three.
Candidates are selected off of the eligible list using the rule of three.
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