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      Question

      What is the fourth proportional to 2, 5,

      12?
      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, => 2 : 5 :: 12 : x =>ย 2x = 5 ร— 12 =>ย x = (5 ร— 12)/2 = 30

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