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Finding the Fourth Proportional to 861,497.78, 1,188,866.97 and 479,516.38

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Solution

The fourth proportional to 861,497.78, 1,188,866.97 and 479,516.38 is: 661,732.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,497.78 : 1,188,866.97 = 479,516.38 : x
  2. Step 2: Convert to fraction form
    861,497.78/1,188,866.97 = 479,516.38/x
  3. Step 3: Cross multiply
    861,497.78x = 1,188,866.97 × 479,516.38
  4. Step 4: Simplify right side
    861,497.78x = 570,081,185,755.97
  5. Step 5: Solve for x
    x = 570,081,185,755.97/861,497.78
  6. Step 6: Final answer
    x = 661,732.62

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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.