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Finding the Fourth Proportional to 121.33, 167.42 and 71.54

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Solution

The fourth proportional to 121.33, 167.42 and 71.54 is: 98.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.33 : 167.42 = 71.54 : x
  2. Step 2: Convert to fraction form
    121.33/167.42 = 71.54/x
  3. Step 3: Cross multiply
    121.33x = 167.42 × 71.54
  4. Step 4: Simplify right side
    121.33x = 11,976.39
  5. Step 5: Solve for x
    x = 11,976.39/121.33
  6. Step 6: Final answer
    x = 98.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.