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Finding the Fourth Proportional to 218,939.72, 328,419.35 and 67,125.88

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Solution

The fourth proportional to 218,939.72, 328,419.35 and 67,125.88 is: 100,691.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,939.72 : 328,419.35 = 67,125.88 : x
  2. Step 2: Convert to fraction form
    218,939.72/328,419.35 = 67,125.88/x
  3. Step 3: Cross multiply
    218,939.72x = 328,419.35 × 67,125.88
  4. Step 4: Simplify right side
    218,939.72x = 22,045,435,900.05
  5. Step 5: Solve for x
    x = 22,045,435,900.05/218,939.72
  6. Step 6: Final answer
    x = 100,691.81

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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.