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Finding the Fourth Proportional to 220.87, 331.11 and 111.25

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Solution

The fourth proportional to 220.87, 331.11 and 111.25 is: 166.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.87 : 331.11 = 111.25 : x
  2. Step 2: Convert to fraction form
    220.87/331.11 = 111.25/x
  3. Step 3: Cross multiply
    220.87x = 331.11 × 111.25
  4. Step 4: Simplify right side
    220.87x = 36,835.99
  5. Step 5: Solve for x
    x = 36,835.99/220.87
  6. Step 6: Final answer
    x = 166.78

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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.