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Finding the Fourth Proportional to 724.92, 1,086.72 and 490.20

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Solution

The fourth proportional to 724.92, 1,086.72 and 490.20 is: 734.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.92 : 1,086.72 = 490.20 : x
  2. Step 2: Convert to fraction form
    724.92/1,086.72 = 490.20/x
  3. Step 3: Cross multiply
    724.92x = 1,086.72 × 490.20
  4. Step 4: Simplify right side
    724.92x = 532,710.14
  5. Step 5: Solve for x
    x = 532,710.14/724.92
  6. Step 6: Final answer
    x = 734.85

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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.