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Finding the Fourth Proportional to 167.61, 251.31 and 80.97

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Solution

The fourth proportional to 167.61, 251.31 and 80.97 is: 121.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.61 : 251.31 = 80.97 : x
  2. Step 2: Convert to fraction form
    167.61/251.31 = 80.97/x
  3. Step 3: Cross multiply
    167.61x = 251.31 × 80.97
  4. Step 4: Simplify right side
    167.61x = 20,348.57
  5. Step 5: Solve for x
    x = 20,348.57/167.61
  6. Step 6: Final answer
    x = 121.40

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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.