The forth proportional to 2,4,6 is?  Options
A) 8
B) 12
C) 15
D) 18
E) 22
Let the fourth proportional to 2,4,6 be x   then 2:4::6:x   2x = 4*6   x = 12   Answer is 12
<result>B</result>
The forth proportional to 2,4,6 is?