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Finding the Fourth Proportional to 726.80, 1,002.65 and 431.90

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Solution

The fourth proportional to 726.80, 1,002.65 and 431.90 is: 595.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.80 : 1,002.65 = 431.90 : x
  2. Step 2: Convert to fraction form
    726.80/1,002.65 = 431.90/x
  3. Step 3: Cross multiply
    726.80x = 1,002.65 × 431.90
  4. Step 4: Simplify right side
    726.80x = 433,044.54
  5. Step 5: Solve for x
    x = 433,044.54/726.80
  6. Step 6: Final answer
    x = 595.82

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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.