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Finding the Fourth Proportional to 192,778.20, 288,972.90 and 87,672.60

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Solution

The fourth proportional to 192,778.20, 288,972.90 and 87,672.60 is: 131,420.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    192,778.20 : 288,972.90 = 87,672.60 : x
  2. Step 2: Convert to fraction form
    192,778.20/288,972.90 = 87,672.60/x
  3. Step 3: Cross multiply
    192,778.20x = 288,972.90 × 87,672.60
  4. Step 4: Simplify right side
    192,778.20x = 25,335,005,472.54
  5. Step 5: Solve for x
    x = 25,335,005,472.54/192,778.20
  6. Step 6: Final answer
    x = 131,420.49

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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.