The geometric mean of two numbers is the square root of their product.
(0.5)(9) = 4.5
Square root of 4.5 = 2.12...
That's the answer.
In other words, 2.12 is bigger than 0.5 by the same factor that 9 is bigger than 2.12.
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The geometric mean of 9 and 81 is 27.0
The geometric mean of 9 and 25 is: 15.0
Geometric mean of 9 and 16 is 12. Look at link: "Calculation of the geometric mean of two numbers".
The geometric mean of 9 and 16 = square root of (9 x 16) = square root of 144 = 12.
√9x1=3