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Finding the Fourth Proportional to 721,658.81, 995,864.46 and 399,382.49

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Solution

The fourth proportional to 721,658.81, 995,864.46 and 399,382.49 is: 551,134.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,658.81 : 995,864.46 = 399,382.49 : x
  2. Step 2: Convert to fraction form
    721,658.81/995,864.46 = 399,382.49/x
  3. Step 3: Cross multiply
    721,658.81x = 995,864.46 × 399,382.49
  4. Step 4: Simplify right side
    721,658.81x = 397,730,822,757.98
  5. Step 5: Solve for x
    x = 397,730,822,757.98/721,658.81
  6. Step 6: Final answer
    x = 551,134.16

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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.