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Finding the Fourth Proportional to 721,713.88, 995,957.82 and 399,424.60

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Solution

The fourth proportional to 721,713.88, 995,957.82 and 399,424.60 is: 551,201.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,713.88 : 995,957.82 = 399,424.60 : x
  2. Step 2: Convert to fraction form
    721,713.88/995,957.82 = 399,424.60/x
  3. Step 3: Cross multiply
    721,713.88x = 995,957.82 × 399,424.60
  4. Step 4: Simplify right side
    721,713.88x = 397,810,053,870.37
  5. Step 5: Solve for x
    x = 397,810,053,870.37/721,713.88
  6. Step 6: Final answer
    x = 551,201.89

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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.