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Finding the Fourth Proportional to 721,778.39, 996,042.11 and 399,481.61

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Solution

The fourth proportional to 721,778.39, 996,042.11 and 399,481.61 is: 551,277.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,778.39 : 996,042.11 = 399,481.61 : x
  2. Step 2: Convert to fraction form
    721,778.39/996,042.11 = 399,481.61/x
  3. Step 3: Cross multiply
    721,778.39x = 996,042.11 × 399,481.61
  4. Step 4: Simplify right side
    721,778.39x = 397,900,506,223.29
  5. Step 5: Solve for x
    x = 397,900,506,223.29/721,778.39
  6. Step 6: Final answer
    x = 551,277.95

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1.5x scale

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.