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Finding the Fourth Proportional to 724.34, 1,086.18 and 431.97

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Solution

The fourth proportional to 724.34, 1,086.18 and 431.97 is: 647.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.34 : 1,086.18 = 431.97 : x
  2. Step 2: Convert to fraction form
    724.34/1,086.18 = 431.97/x
  3. Step 3: Cross multiply
    724.34x = 1,086.18 × 431.97
  4. Step 4: Simplify right side
    724.34x = 469,197.17
  5. Step 5: Solve for x
    x = 469,197.17/724.34
  6. Step 6: Final answer
    x = 647.76

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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.