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      Question

      What is the fourth proportional to 5, 7,

      15?
      A 30 Correct Answer Incorrect Answer
      B 21 Correct Answer Incorrect Answer
      C 36 Correct Answer Incorrect Answer
      D 14 Correct Answer Incorrect Answer

      Solution

      Let the fourth proportion be x. Then, => 5 : 7 :: 15 : x => 5x = 7 × 15 => x = (7 × 15)/5 = 21

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