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Finding the Fourth Proportional to 132.12, 198.15 and 40.80

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Solution

The fourth proportional to 132.12, 198.15 and 40.80 is: 61.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.12 : 198.15 = 40.80 : x
  2. Step 2: Convert to fraction form
    132.12/198.15 = 40.80/x
  3. Step 3: Cross multiply
    132.12x = 198.15 × 40.80
  4. Step 4: Simplify right side
    132.12x = 8,084.52
  5. Step 5: Solve for x
    x = 8,084.52/132.12
  6. Step 6: Final answer
    x = 61.19

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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.