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Finding the Fourth Proportional to 721.62, 1,082.39 and 478.31

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Solution

The fourth proportional to 721.62, 1,082.39 and 478.31 is: 717.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.62 : 1,082.39 = 478.31 : x
  2. Step 2: Convert to fraction form
    721.62/1,082.39 = 478.31/x
  3. Step 3: Cross multiply
    721.62x = 1,082.39 × 478.31
  4. Step 4: Simplify right side
    721.62x = 517,710.16
  5. Step 5: Solve for x
    x = 517,710.16/721.62
  6. Step 6: Final answer
    x = 717.43

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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.