• synonyms

mean proportional

noun Mathematics.
  1. (between two numbers a and b) a number x for which a/x = x/b: The number 3 is a mean proportional between 1 and 9.
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Origin of mean proportional

First recorded in 1565–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018