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Finding the Fourth Proportional to 167.72, 251.34 and 71.48

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Solution

The fourth proportional to 167.72, 251.34 and 71.48 is: 107.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.72 : 251.34 = 71.48 : x
  2. Step 2: Convert to fraction form
    167.72/251.34 = 71.48/x
  3. Step 3: Cross multiply
    167.72x = 251.34 × 71.48
  4. Step 4: Simplify right side
    167.72x = 17,965.78
  5. Step 5: Solve for x
    x = 17,965.78/167.72
  6. Step 6: Final answer
    x = 107.12

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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.