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    Question

    What is the fourth proportion of 18, 20 and

    23?
    A 159/5 Correct Answer Incorrect Answer
    B 230/9 Correct Answer Incorrect Answer
    C 114/7 Correct Answer Incorrect Answer
    D None of these Correct Answer Incorrect Answer

    Solution

    We know the formula to find the fourth proportion - => a : b = c : d => 18 : 20 :: 23 : d => d = (23 × 20)/18 => d = 230/9

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