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Finding the Fourth Proportional to 394,444.78, 591,292.59 and 128,018.97

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Solution

The fourth proportional to 394,444.78, 591,292.59 and 128,018.97 is: 191,906.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,444.78 : 591,292.59 = 128,018.97 : x
  2. Step 2: Convert to fraction form
    394,444.78/591,292.59 = 128,018.97/x
  3. Step 3: Cross multiply
    394,444.78x = 591,292.59 × 128,018.97
  4. Step 4: Simplify right side
    394,444.78x = 75,696,668,340.43
  5. Step 5: Solve for x
    x = 75,696,668,340.43/394,444.78
  6. Step 6: Final answer
    x = 191,906.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.