Eighteen is the Geometric Mean of 12 and what number

18 = sqrt (12 x)
Solve for x.
The answer is an integer, and it isn't 24 (That's the arithmetic mean).

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2 answers

what is the meaning of geometric sequence?
how many geometric means are there between 10 and 1280 where the ratio of forst mean is to the last mean is as 1:32