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Find the value of x such that the proportion x : 12 :: 3 : 4 is true?
  1. 9
  2. 12
  3. 4
  4. None of these
Explanation

To solve the proportion:

x : 12 :: 3 : 4

We can set up an equation based on the ratio:

x/12 = 3/4

Cross-multiply:

4x = 3 * 12

4x = 36

Divide both sides by 4:

x = 36/4

x = 9

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