Question

78 is the geometric mean of 30 and what number

Answer 1

Answer:

202.8

Step-by-step explanation:

The geometric mean of 2 numbers a and b is

$\sqrt{ab}$

Here a = 30 and mean = 78, thus

$\sqrt{30b}$ = 78

To clear the radical square both sides

($\sqrt{30b}$ )² = 78², that is

30b = 6084 ( divide both sides by 30 )

b = $\frac{6084}{30}$ = 202.8