The forth proportional to 12,8,15 is?	Select.
A) 15 B) 12 C) 18 D) 10 E) 24
Let the fourth proportional to 12,8,15 be x   then 12:8::15:x   12x = 8*15   x = 10   Answer is 10
<result>D</result>
The forth proportional to 12,8,15 is?