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Finding the Fourth Proportional to 167.47, 251.21 and 71.28

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Solution

The fourth proportional to 167.47, 251.21 and 71.28 is: 106.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.47 : 251.21 = 71.28 : x
  2. Step 2: Convert to fraction form
    167.47/251.21 = 71.28/x
  3. Step 3: Cross multiply
    167.47x = 251.21 × 71.28
  4. Step 4: Simplify right side
    167.47x = 17,906.25
  5. Step 5: Solve for x
    x = 17,906.25/167.47
  6. Step 6: Final answer
    x = 106.92

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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.