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Finding the Fourth Proportional to 218,793.20, 328,092.60 and 85,629.20

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Solution

The fourth proportional to 218,793.20, 328,092.60 and 85,629.20 is: 128,405.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,793.20 : 328,092.60 = 85,629.20 : x
  2. Step 2: Convert to fraction form
    218,793.20/328,092.60 = 85,629.20/x
  3. Step 3: Cross multiply
    218,793.20x = 328,092.60 × 85,629.20
  4. Step 4: Simplify right side
    218,793.20x = 28,094,306,863.92
  5. Step 5: Solve for x
    x = 28,094,306,863.92/218,793.20
  6. Step 6: Final answer
    x = 128,405.76

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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.