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Finding the Fourth Proportional to 121.15, 166.97 and 84.22

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Solution

The fourth proportional to 121.15, 166.97 and 84.22 is: 116.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.15 : 166.97 = 84.22 : x
  2. Step 2: Convert to fraction form
    121.15/166.97 = 84.22/x
  3. Step 3: Cross multiply
    121.15x = 166.97 × 84.22
  4. Step 4: Simplify right side
    121.15x = 14,060.96
  5. Step 5: Solve for x
    x = 14,060.96/121.15
  6. Step 6: Final answer
    x = 116.07

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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.