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Finding the Fourth Proportional to 118.38, 163.44 and 81.53

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Solution

The fourth proportional to 118.38, 163.44 and 81.53 is: 112.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.38 : 163.44 = 81.53 : x
  2. Step 2: Convert to fraction form
    118.38/163.44 = 81.53/x
  3. Step 3: Cross multiply
    118.38x = 163.44 × 81.53
  4. Step 4: Simplify right side
    118.38x = 13,324.45
  5. Step 5: Solve for x
    x = 13,324.45/118.38
  6. Step 6: Final answer
    x = 112.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.