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Finding the Fourth Proportional to 724.84, 1,000.31 and 393.28

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Solution

The fourth proportional to 724.84, 1,000.31 and 393.28 is: 542.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.84 : 1,000.31 = 393.28 : x
  2. Step 2: Convert to fraction form
    724.84/1,000.31 = 393.28/x
  3. Step 3: Cross multiply
    724.84x = 1,000.31 × 393.28
  4. Step 4: Simplify right side
    724.84x = 393,400.54
  5. Step 5: Solve for x
    x = 393,400.54/724.84
  6. Step 6: Final answer
    x = 542.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.