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Finding the Fourth Proportional to 724.57, 999.78 and 429.91

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Solution

The fourth proportional to 724.57, 999.78 and 429.91 is: 593.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.57 : 999.78 = 429.91 : x
  2. Step 2: Convert to fraction form
    724.57/999.78 = 429.91/x
  3. Step 3: Cross multiply
    724.57x = 999.78 × 429.91
  4. Step 4: Simplify right side
    724.57x = 429,815.42
  5. Step 5: Solve for x
    x = 429,815.42/724.57
  6. Step 6: Final answer
    x = 593.20

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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.