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Finding the Fourth Proportional to 724.28, 1,086.21 and 353.97

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Solution

The fourth proportional to 724.28, 1,086.21 and 353.97 is: 530.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.28 : 1,086.21 = 353.97 : x
  2. Step 2: Convert to fraction form
    724.28/1,086.21 = 353.97/x
  3. Step 3: Cross multiply
    724.28x = 1,086.21 × 353.97
  4. Step 4: Simplify right side
    724.28x = 384,485.75
  5. Step 5: Solve for x
    x = 384,485.75/724.28
  6. Step 6: Final answer
    x = 530.86

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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.