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Finding the Fourth Proportional to 220,138.20, 330,207.30 and 79,878.60

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Solution

The fourth proportional to 220,138.20, 330,207.30 and 79,878.60 is: 119,817.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,138.20 : 330,207.30 = 79,878.60 : x
  2. Step 2: Convert to fraction form
    220,138.20/330,207.30 = 79,878.60/x
  3. Step 3: Cross multiply
    220,138.20x = 330,207.30 × 79,878.60
  4. Step 4: Simplify right side
    220,138.20x = 26,376,496,833.78
  5. Step 5: Solve for x
    x = 26,376,496,833.78/220,138.20
  6. Step 6: Final answer
    x = 119,817.90

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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.