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Finding the Fourth Proportional to 132.46, 198.60 and 81.20

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Solution

The fourth proportional to 132.46, 198.60 and 81.20 is: 121.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.46 : 198.60 = 81.20 : x
  2. Step 2: Convert to fraction form
    132.46/198.60 = 81.20/x
  3. Step 3: Cross multiply
    132.46x = 198.60 × 81.20
  4. Step 4: Simplify right side
    132.46x = 16,126.97
  5. Step 5: Solve for x
    x = 16,126.97/132.46
  6. Step 6: Final answer
    x = 121.75

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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.