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      Question

      Find the fourth proportion of (k + 2), (2k), and (3k +

      6). (Note: 'k' is the smallest two-digit prime number.)
      A 64 Correct Answer Incorrect Answer
      B 65 Correct Answer Incorrect Answer
      C 66 Correct Answer Incorrect Answer
      D 68 Correct Answer Incorrect Answer

      Solution

      k = 11
      k + 2 = 13
      2k = 22
      3k + 6 = 33 + 6 = 39
      13 : 22 :: 39 : m
      13m = 22 × 39 = 858
      m = 858 ÷ 13 = 66

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