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Finding the Fourth Proportional to 220,139.70, 329,772.15 and 120,120.90

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Solution

The fourth proportional to 220,139.70, 329,772.15 and 120,120.90 is: 179,942.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,139.70 : 329,772.15 = 120,120.90 : x
  2. Step 2: Convert to fraction form
    220,139.70/329,772.15 = 120,120.90/x
  3. Step 3: Cross multiply
    220,139.70x = 329,772.15 × 120,120.90
  4. Step 4: Simplify right side
    220,139.70x = 39,612,527,452.94
  5. Step 5: Solve for x
    x = 39,612,527,452.94/220,139.70
  6. Step 6: Final answer
    x = 179,942.68

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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.