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Finding the Fourth Proportional to 394,657.92, 591,849.18 and 128,368.80

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Solution

The fourth proportional to 394,657.92, 591,849.18 and 128,368.80 is: 192,508.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,657.92 : 591,849.18 = 128,368.80 : x
  2. Step 2: Convert to fraction form
    394,657.92/591,849.18 = 128,368.80/x
  3. Step 3: Cross multiply
    394,657.92x = 591,849.18 × 128,368.80
  4. Step 4: Simplify right side
    394,657.92x = 75,974,969,017.58
  5. Step 5: Solve for x
    x = 75,974,969,017.58/394,657.92
  6. Step 6: Final answer
    x = 192,508.41

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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.