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      Question

      What is the fourth proportional to 5, 9,

      25?
      A 30 Correct Answer Incorrect Answer
      B 45 Correct Answer Incorrect Answer
      C 36 Correct Answer Incorrect Answer
      D 40 Correct Answer Incorrect Answer

      Solution

      Let the fourth proportion be x. Then, => 5 : 9 :: 25 : x => 5x = 25 × 9 => x = (25 × 9)/5 = 45

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