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Finding the Fourth Proportional to 681,350.78, 940,055.94 and 394,815.50

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Solution

The fourth proportional to 681,350.78, 940,055.94 and 394,815.50 is: 544,724.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,350.78 : 940,055.94 = 394,815.50 : x
  2. Step 2: Convert to fraction form
    681,350.78/940,055.94 = 394,815.50/x
  3. Step 3: Cross multiply
    681,350.78x = 940,055.94 × 394,815.50
  4. Step 4: Simplify right side
    681,350.78x = 371,148,655,979.07
  5. Step 5: Solve for x
    x = 371,148,655,979.07/681,350.78
  6. Step 6: Final answer
    x = 544,724.78

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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.