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Finding the Fourth Proportional to 724.61, 999.97 and 393.04

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Solution

The fourth proportional to 724.61, 999.97 and 393.04 is: 542.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.61 : 999.97 = 393.04 : x
  2. Step 2: Convert to fraction form
    724.61/999.97 = 393.04/x
  3. Step 3: Cross multiply
    724.61x = 999.97 × 393.04
  4. Step 4: Simplify right side
    724.61x = 393,022.30
  5. Step 5: Solve for x
    x = 393,022.30/724.61
  6. Step 6: Final answer
    x = 542.39

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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.