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Finding the Fourth Proportional to 167.88, 251.59 and 86.55

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Solution

The fourth proportional to 167.88, 251.59 and 86.55 is: 129.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.88 : 251.59 = 86.55 : x
  2. Step 2: Convert to fraction form
    167.88/251.59 = 86.55/x
  3. Step 3: Cross multiply
    167.88x = 251.59 × 86.55
  4. Step 4: Simplify right side
    167.88x = 21,775.11
  5. Step 5: Solve for x
    x = 21,775.11/167.88
  6. Step 6: Final answer
    x = 129.71

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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.