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Finding the Fourth Proportional to 167.38, 251.19 and 86.21

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Solution

The fourth proportional to 167.38, 251.19 and 86.21 is: 129.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.38 : 251.19 = 86.21 : x
  2. Step 2: Convert to fraction form
    167.38/251.19 = 86.21/x
  3. Step 3: Cross multiply
    167.38x = 251.19 × 86.21
  4. Step 4: Simplify right side
    167.38x = 21,655.09
  5. Step 5: Solve for x
    x = 21,655.09/167.38
  6. Step 6: Final answer
    x = 129.38

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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.