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Finding the Fourth Proportional to 221,425.85, 332,138.78 and 81,239.15

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Solution

The fourth proportional to 221,425.85, 332,138.78 and 81,239.15 is: 121,858.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,425.85 : 332,138.78 = 81,239.15 : x
  2. Step 2: Convert to fraction form
    221,425.85/332,138.78 = 81,239.15/x
  3. Step 3: Cross multiply
    221,425.85x = 332,138.78 × 81,239.15
  4. Step 4: Simplify right side
    221,425.85x = 26,982,671,763.04
  5. Step 5: Solve for x
    x = 26,982,671,763.04/221,425.85
  6. Step 6: Final answer
    x = 121,858.73

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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.