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Finding the Fourth Proportional to 726.71, 1,002.65 and 431.87

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Solution

The fourth proportional to 726.71, 1,002.65 and 431.87 is: 595.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.71 : 1,002.65 = 431.87 : x
  2. Step 2: Convert to fraction form
    726.71/1,002.65 = 431.87/x
  3. Step 3: Cross multiply
    726.71x = 1,002.65 × 431.87
  4. Step 4: Simplify right side
    726.71x = 433,007.28
  5. Step 5: Solve for x
    x = 433,007.28/726.71
  6. Step 6: Final answer
    x = 595.85

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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.