Find the fourth proportional to 4, 9, 12
Pick.
A) 17  B) 37  C) 47  D) 67  E) 27
Let the fourth proportional to 4, 9, 12 be x.   Then, 4 : 9 : : 12 : x   =4 x x=9x12   =X=(9 x 12)/14=27;   Fourth proportional to 4, 9, 12 is 27.   Answer is 27
<result>E</result>
Find the fourth proportional to 4, 9, 12