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Finding the Fourth Proportional to 121.20, 166.92 and 88.40

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Solution

The fourth proportional to 121.20, 166.92 and 88.40 is: 121.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.20 : 166.92 = 88.40 : x
  2. Step 2: Convert to fraction form
    121.20/166.92 = 88.40/x
  3. Step 3: Cross multiply
    121.20x = 166.92 × 88.40
  4. Step 4: Simplify right side
    121.20x = 14,755.73
  5. Step 5: Solve for x
    x = 14,755.73/121.20
  6. Step 6: Final answer
    x = 121.75

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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.