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Finding the Fourth Proportional to 220.91, 331.11 and 83.87

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Solution

The fourth proportional to 220.91, 331.11 and 83.87 is: 125.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.91 : 331.11 = 83.87 : x
  2. Step 2: Convert to fraction form
    220.91/331.11 = 83.87/x
  3. Step 3: Cross multiply
    220.91x = 331.11 × 83.87
  4. Step 4: Simplify right side
    220.91x = 27,768.54
  5. Step 5: Solve for x
    x = 27,768.54/220.91
  6. Step 6: Final answer
    x = 125.70

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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.