Select the option that is related to the fourth number in the same way as the first number is related to the second number.

12 : 72 :: ? : 98

Given: 12 : 72 :: ? : 98

Logic: 1st number $$\times$$ half of 1st number = 2nd number 

12 $$\times$$​ 6 = 72

Now, we check each options.

Option (a): 38 (Not Follow)

38 $$\times$$19 = 722 $$\neq$$ 98

Option (b): 19 (Not Follow)​

19 $$\times$$ 9.5 = 180.5  $$\neq$$ 98 

Option (c): 17 (Not Follow)​

17 $$\times$$ 8.5 = 144.5 $$\neq$$ 98​

Option (d): 38 (Follow)​

14 $$\times$$ 7 = 98

Thus, correct option is (d).