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Finding the Fourth Proportional to 132.70, 198.80 and 81.37

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Solution

The fourth proportional to 132.70, 198.80 and 81.37 is: 121.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.70 : 198.80 = 81.37 : x
  2. Step 2: Convert to fraction form
    132.70/198.80 = 81.37/x
  3. Step 3: Cross multiply
    132.70x = 198.80 × 81.37
  4. Step 4: Simplify right side
    132.70x = 16,176.36
  5. Step 5: Solve for x
    x = 16,176.36/132.70
  6. Step 6: Final answer
    x = 121.90

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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.