The forth proportional to 5,8,15 is? Choose the correct choice
A) 15
B) 12
C) 18
D) 20
E) 24
Let the fourth proportional to 5,8,15 be x   then 5:8::15:x   5x = 8*15   x = 24   Answer is 24
<result>E</result>
The forth proportional to 5,8,15 is?