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      Question

      Find the fourth proportion of (3k + 3), (6k + 6) and

      (9k + 9). (Note: 'k' is the largest single-digit composite number.)
      A 120 Correct Answer Incorrect Answer
      B 150 Correct Answer Incorrect Answer
      C 160 Correct Answer Incorrect Answer
      D 180 Correct Answer Incorrect Answer

      Solution

      'k' = 9 3k + 3 = 3 Γ— 9 + 3 = 30 6k + 6 = 6 Γ— 9 + 6 = 60 9k + 9 = 9 Γ— 9 + 9 = 90 Let the fourth proportion be 'm'. 30 : 60 :: 90 : m So, 30 Γ— m = 60 Γ— 90 Or, 'm' = 180

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