Choose the correct option for the missing term. 27 : 18 : 102 : ?

The correct answer is Option (2) → 68

27 : 18 : 102 : ?

THE LOGIC FOLLOWED HERE IS :

(IIND NUMBER  ÷ 2 ) × 3 = IST NUMBER

AS

(18  ÷ 2 ) × 3 = IST NUMBER

9 × 3 = IST NUMBER

27 = IST NUMBER

SIMILARLY

(X  ÷ 2 ) × 3 = 102

(X  ÷ 2 )   = 102 ÷ 3

(X  ÷ 2 )   = 34

         X    = 34 × 2

         X = 68