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Finding the Fourth Proportional to 132.74, 198.80 and 78.53

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Solution

The fourth proportional to 132.74, 198.80 and 78.53 is: 117.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.74 : 198.80 = 78.53 : x
  2. Step 2: Convert to fraction form
    132.74/198.80 = 78.53/x
  3. Step 3: Cross multiply
    132.74x = 198.80 × 78.53
  4. Step 4: Simplify right side
    132.74x = 15,610.97
  5. Step 5: Solve for x
    x = 15,610.97/132.74
  6. Step 6: Final answer
    x = 117.61

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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.