Select the option that is related to the third number in the same way as the second number is related to the first number and the sixth number is related to the fifth number.

12 : 72 :: 18 : ? :: 22 : 242

162

12 : 72 :: 18 : ? :: 22 : 242

The logic followed here is

Ist number² ÷ 2 = IInd number

As

12² ÷ 2 = 144 ÷ 2 = 72

and

22 : 242

22² ÷ 2 = 484 ÷ 2 = 242

Similarly

18 : ?

18² ÷ 2 = 324 ÷ 2 = 162