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Finding the Fourth Proportional to 721,631.43, 995,841.54 and 399,321.90

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Solution

The fourth proportional to 721,631.43, 995,841.54 and 399,321.90 is: 551,058.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,631.43 : 995,841.54 = 399,321.90 : x
  2. Step 2: Convert to fraction form
    721,631.43/995,841.54 = 399,321.90/x
  3. Step 3: Cross multiply
    721,631.43x = 995,841.54 × 399,321.90
  4. Step 4: Simplify right side
    721,631.43x = 397,661,335,851.73
  5. Step 5: Solve for x
    x = 397,661,335,851.73/721,631.43
  6. Step 6: Final answer
    x = 551,058.78

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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.