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 Geometric Mean:  If a/x = x/b (or x2 = ab), then x is called the geometric mean between a and b. The geometric mean is sometimes called the mean proportional.

From Ask Dr. Math at the Math Forum: Read another explanation of arithmetic and geometric means.

Arithmetic vs Geometric Mean: The Math Forum's comparison between the arithmetic and the geometric mean.

Examples of Arithmetic and Geometric Means: Two examples of problems that involve arithmetic and geometric means.