# Mean Proportional

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## mean proportional

[′mēn prə′pȯr·shən·əl] (mathematics)

For two numbers

*a*and*b*, a number*x*, such that*x*/*a*=*b*/*x*.McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

The following article is from

*The Great Soviet Encyclopedia*(1979). It might be outdated or ideologically biased.## Mean Proportional

A mean proportional between two positive numbers is a number equal to the square root of their product. Thus, if *a:x* = *x:b*, then *x* is a mean proportional between *a* and *b*, and . The mean proportional *x* is also called the geometric mean of *a* and *b*.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.