Home / 1,991.28-2,748.12-1,107.24

Finding the Fourth Proportional to 1,991.28, 2,748.12 and 1,107.24

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Solution

The fourth proportional to 1,991.28, 2,748.12 and 1,107.24 is: 1,528.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.28 : 2,748.12 = 1,107.24 : x
  2. Step 2: Convert to fraction form
    1,991.28/2,748.12 = 1,107.24/x
  3. Step 3: Cross multiply
    1,991.28x = 2,748.12 × 1,107.24
  4. Step 4: Simplify right side
    1,991.28x = 3,042,828.39
  5. Step 5: Solve for x
    x = 3,042,828.39/1,991.28
  6. Step 6: Final answer
    x = 1,528.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.