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Finding the Fourth Proportional to 1,139.52, 1,711.20 and 924.48

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Solution

The fourth proportional to 1,139.52, 1,711.20 and 924.48 is: 1,388.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.52 : 1,711.20 = 924.48 : x
  2. Step 2: Convert to fraction form
    1,139.52/1,711.20 = 924.48/x
  3. Step 3: Cross multiply
    1,139.52x = 1,711.20 × 924.48
  4. Step 4: Simplify right side
    1,139.52x = 1,581,970.18
  5. Step 5: Solve for x
    x = 1,581,970.18/1,139.52
  6. Step 6: Final answer
    x = 1,388.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.