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Finding the Fourth Proportional to 721,737.76, 996,000 and 399,470.08

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Solution

The fourth proportional to 721,737.76, 996,000 and 399,470.08 is: 551,269.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,737.76 : 996,000 = 399,470.08 : x
  2. Step 2: Convert to fraction form
    721,737.76/996,000 = 399,470.08/x
  3. Step 3: Cross multiply
    721,737.76x = 996,000 × 399,470.08
  4. Step 4: Simplify right side
    721,737.76x = 397,872,199,680
  5. Step 5: Solve for x
    x = 397,872,199,680/721,737.76
  6. Step 6: Final answer
    x = 551,269.76

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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.