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Finding the Fourth Proportional to 724.13, 1,086.20 and 261.91

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Solution

The fourth proportional to 724.13, 1,086.20 and 261.91 is: 392.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.13 : 1,086.20 = 261.91 : x
  2. Step 2: Convert to fraction form
    724.13/1,086.20 = 261.91/x
  3. Step 3: Cross multiply
    724.13x = 1,086.20 × 261.91
  4. Step 4: Simplify right side
    724.13x = 284,487.67
  5. Step 5: Solve for x
    x = 284,487.67/724.13
  6. Step 6: Final answer
    x = 392.87

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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.