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Finding the Fourth Proportional to 167.28, 250.89 and 81.78

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Solution

The fourth proportional to 167.28, 250.89 and 81.78 is: 122.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.28 : 250.89 = 81.78 : x
  2. Step 2: Convert to fraction form
    167.28/250.89 = 81.78/x
  3. Step 3: Cross multiply
    167.28x = 250.89 × 81.78
  4. Step 4: Simplify right side
    167.28x = 20,517.78
  5. Step 5: Solve for x
    x = 20,517.78/167.28
  6. Step 6: Final answer
    x = 122.66

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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.