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Finding the Fourth Proportional to 132.78, 198.96 and 78.54

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Solution

The fourth proportional to 132.78, 198.96 and 78.54 is: 117.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.78 : 198.96 = 78.54 : x
  2. Step 2: Convert to fraction form
    132.78/198.96 = 78.54/x
  3. Step 3: Cross multiply
    132.78x = 198.96 × 78.54
  4. Step 4: Simplify right side
    132.78x = 15,626.32
  5. Step 5: Solve for x
    x = 15,626.32/132.78
  6. Step 6: Final answer
    x = 117.69

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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.