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Finding the Fourth Proportional to 121.08, 167.15 and 81.80

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Solution

The fourth proportional to 121.08, 167.15 and 81.80 is: 112.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.08 : 167.15 = 81.80 : x
  2. Step 2: Convert to fraction form
    121.08/167.15 = 81.80/x
  3. Step 3: Cross multiply
    121.08x = 167.15 × 81.80
  4. Step 4: Simplify right side
    121.08x = 13,672.87
  5. Step 5: Solve for x
    x = 13,672.87/121.08
  6. Step 6: Final answer
    x = 112.92

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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.