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      Question

      What is the fourth proportional to 816, 226,

      408?
      A 108 Correct Answer Incorrect Answer
      B 103 Correct Answer Incorrect Answer
      C 113 Correct Answer Incorrect Answer
      D 117 Correct Answer Incorrect Answer

      Solution

      Let the fourth proportion be x. 816: 226: 408: x 816×x =226×408 x =226×408/816 =113 The fourth proportion is 113.

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