Q: Is 18 the geometric mean between 4 and 9?

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Look 2 and 8, their geometric mean is square root of 16 which is 4 and between 2 and 54. 9 and 4 have a geometric mean of 6 which is also between 2 and 54. Is this what you mean? Pun intended... The geometric mean of 2 and 54 is square root of 108.

It is 2.0

√4 x √20 = 2 x 4.47213595499958 = 8.94427190999916In simplified form it is 8 and 17 over 18.

Geometric mean of 2 and 8 = sqrt(2*8) = sqrt(16) = 4

It is sqrt(20) = 4.4721, approx.

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No. Geometric mean of n numbers is the nth root of the product of the n numbers. → geometric mean of 4 and 9 is √(4×9) = √36 = 6.

10

Look 2 and 8, their geometric mean is square root of 16 which is 4 and between 2 and 54. 9 and 4 have a geometric mean of 6 which is also between 2 and 54. Is this what you mean? Pun intended... The geometric mean of 2 and 54 is square root of 108.

It is 2.0

√4 x √20 = 2 x 4.47213595499958 = 8.94427190999916In simplified form it is 8 and 17 over 18.

The geometric mean of 4 and 5 is 4.472135955

Geometric mean of 2 and 8 = sqrt(2*8) = sqrt(16) = 4

It is sqrt(20) = 4.4721, approx.

mean = (4 + 81)/2 = 85/2 = 42.5

It is sqrt(96) = 4*sqrt(6)

2 sqrt(6)

4.0