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Finding the Fourth Proportional to 747.92, 1,120.23 and 487.01

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Solution

The fourth proportional to 747.92, 1,120.23 and 487.01 is: 729.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.92 : 1,120.23 = 487.01 : x
  2. Step 2: Convert to fraction form
    747.92/1,120.23 = 487.01/x
  3. Step 3: Cross multiply
    747.92x = 1,120.23 × 487.01
  4. Step 4: Simplify right side
    747.92x = 545,557.61
  5. Step 5: Solve for x
    x = 545,557.61/747.92
  6. Step 6: Final answer
    x = 729.44

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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.