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Finding the Fourth Proportional to 220.90, 331.14 and 83.86

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Solution

The fourth proportional to 220.90, 331.14 and 83.86 is: 125.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.90 : 331.14 = 83.86 : x
  2. Step 2: Convert to fraction form
    220.90/331.14 = 83.86/x
  3. Step 3: Cross multiply
    220.90x = 331.14 × 83.86
  4. Step 4: Simplify right side
    220.90x = 27,769.40
  5. Step 5: Solve for x
    x = 27,769.40/220.90
  6. Step 6: Final answer
    x = 125.71

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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.