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Finding the Fourth Proportional to 167.56, 251.41 and 86.42

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Solution

The fourth proportional to 167.56, 251.41 and 86.42 is: 129.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.56 : 251.41 = 86.42 : x
  2. Step 2: Convert to fraction form
    167.56/251.41 = 86.42/x
  3. Step 3: Cross multiply
    167.56x = 251.41 × 86.42
  4. Step 4: Simplify right side
    167.56x = 21,726.85
  5. Step 5: Solve for x
    x = 21,726.85/167.56
  6. Step 6: Final answer
    x = 129.67

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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.