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Finding the Fourth Proportional to 721,778.64, 996,042.45 and 399,481.86

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Solution

The fourth proportional to 721,778.64, 996,042.45 and 399,481.86 is: 551,278.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,778.64 : 996,042.45 = 399,481.86 : x
  2. Step 2: Convert to fraction form
    721,778.64/996,042.45 = 399,481.86/x
  3. Step 3: Cross multiply
    721,778.64x = 996,042.45 × 399,481.86
  4. Step 4: Simplify right side
    721,778.64x = 397,900,890,564.96
  5. Step 5: Solve for x
    x = 397,900,890,564.96/721,778.64
  6. Step 6: Final answer
    x = 551,278.28

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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.