The mean proportional between 45 and a certain number is three times the mean proportional between 5 and 22. The number is ?  Choose the correct choice from the following options
A) 24
B) 49
C) 22
D) 9
E) 8
If X be the required number, then   (45 x X)1/2 = 3 x (5 x 22)1/2   45X = 9 x 110   X = 22   ANSWER:22
<result>C</result>
The mean proportional between 45 and a certain number is three times the mean proportional between 5 and 22. The number is ?