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Finding the Fourth Proportional to 726.20, 1,002.17 and 411.43

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Solution

The fourth proportional to 726.20, 1,002.17 and 411.43 is: 567.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.20 : 1,002.17 = 411.43 : x
  2. Step 2: Convert to fraction form
    726.20/1,002.17 = 411.43/x
  3. Step 3: Cross multiply
    726.20x = 1,002.17 × 411.43
  4. Step 4: Simplify right side
    726.20x = 412,322.80
  5. Step 5: Solve for x
    x = 412,322.80/726.20
  6. Step 6: Final answer
    x = 567.78

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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.