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Finding the Fourth Proportional to 724.68, 1,086.17 and 308.13

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Solution

The fourth proportional to 724.68, 1,086.17 and 308.13 is: 461.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.68 : 1,086.17 = 308.13 : x
  2. Step 2: Convert to fraction form
    724.68/1,086.17 = 308.13/x
  3. Step 3: Cross multiply
    724.68x = 1,086.17 × 308.13
  4. Step 4: Simplify right side
    724.68x = 334,680.02
  5. Step 5: Solve for x
    x = 334,680.02/724.68
  6. Step 6: Final answer
    x = 461.83

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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.