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Finding the Fourth Proportional to 218,649.72, 328,057.20 and 85,625.04

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Solution

The fourth proportional to 218,649.72, 328,057.20 and 85,625.04 is: 128,469.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,649.72 : 328,057.20 = 85,625.04 : x
  2. Step 2: Convert to fraction form
    218,649.72/328,057.20 = 85,625.04/x
  3. Step 3: Cross multiply
    218,649.72x = 328,057.20 × 85,625.04
  4. Step 4: Simplify right side
    218,649.72x = 28,089,910,872.29
  5. Step 5: Solve for x
    x = 28,089,910,872.29/218,649.72
  6. Step 6: Final answer
    x = 128,469.91

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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.