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Finding the Fourth Proportional to 167.91, 251.74 and 81.24

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Solution

The fourth proportional to 167.91, 251.74 and 81.24 is: 121.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.91 : 251.74 = 81.24 : x
  2. Step 2: Convert to fraction form
    167.91/251.74 = 81.24/x
  3. Step 3: Cross multiply
    167.91x = 251.74 × 81.24
  4. Step 4: Simplify right side
    167.91x = 20,450.52
  5. Step 5: Solve for x
    x = 20,450.52/167.91
  6. Step 6: Final answer
    x = 121.80

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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.