The geometric mean of 3 and 75 is 15.0
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The Geometric Mean (G) of two numbers is given by the formula, G = √ab
The GM of 75 and 3 is thus, √(75 x 3) = √225 = 15
The geometric mean of 3 and 27 is 9.0
The geometric mean of 3 an 48 is 12 [√(3 x 48) = √144 = 12]
It is 11.6190, approx.
If, by geometric number (?) you mean geometric mean, then the answer is 40.
3.4641 (rounded)