It is 11.6190, approx.
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The geometric mean of 3 and 27 is 9.0
First you have to set up a proprtion. 45 over x equals x over 5. Then you get x squared equals 225(45*5). Finally you have to find the square root of 225 which is 15.
The geometric mean of 3 an 48 is 12 [√(3 x 48) = √144 = 12]
The geometric mean of 3 and 75 is 15.0
9/x = x/225 x2 = 2,025 x = 45