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Finding the Fourth Proportional to 721,842.82, 996,117.69 and 399,553.54

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Solution

The fourth proportional to 721,842.82, 996,117.69 and 399,553.54 is: 551,369.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,842.82 : 996,117.69 = 399,553.54 : x
  2. Step 2: Convert to fraction form
    721,842.82/996,117.69 = 399,553.54/x
  3. Step 3: Cross multiply
    721,842.82x = 996,117.69 × 399,553.54
  4. Step 4: Simplify right side
    721,842.82x = 398,002,349,296.12
  5. Step 5: Solve for x
    x = 398,002,349,296.12/721,842.82
  6. Step 6: Final answer
    x = 551,369.82

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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.