The forth proportional to 6,8,15 is?
Choose the correct choice from the following answers:
A) 15 B) 12 C) 18 D) 20 E) 24
Let the fourth proportional to 6,8,15 be x   then 6:8::15:x   6x = 8*15   x = 20   Answer is 20
<result>D</result>
The forth proportional to 6,8,15 is?