The geometric mean of 4 and 5 is 4.472135955
If, by geometric number (?) you mean geometric mean, then the answer is 40.
Geometric mean of 5 and 15= √(5x15)=√75=5√3
Geometric mean = sqrt(5*80) = sqrt(400) = 20
The geometric mean is 45.0
The geometric mean of 5 and 15 is sqrt (5x15)= sqrt (75)= 5sqrt(3).
geometric mean of 6 and 30=√(6x30)=√180=6√5
5
it is 10
11.18034
√10
10.9544511501