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Finding the Fourth Proportional to 724.68, 999.80 and 429.90

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Solution

The fourth proportional to 724.68, 999.80 and 429.90 is: 593.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.68 : 999.80 = 429.90 : x
  2. Step 2: Convert to fraction form
    724.68/999.80 = 429.90/x
  3. Step 3: Cross multiply
    724.68x = 999.80 × 429.90
  4. Step 4: Simplify right side
    724.68x = 429,814.02
  5. Step 5: Solve for x
    x = 429,814.02/724.68
  6. Step 6: Final answer
    x = 593.11

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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.