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Finding the Fourth Proportional to 724.55, 1,086.84 and 520.85

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Solution

The fourth proportional to 724.55, 1,086.84 and 520.85 is: 781.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.55 : 1,086.84 = 520.85 : x
  2. Step 2: Convert to fraction form
    724.55/1,086.84 = 520.85/x
  3. Step 3: Cross multiply
    724.55x = 1,086.84 × 520.85
  4. Step 4: Simplify right side
    724.55x = 566,080.61
  5. Step 5: Solve for x
    x = 566,080.61/724.55
  6. Step 6: Final answer
    x = 781.29

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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.