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Finding the Fourth Proportional to 118.38, 163.38 and 71.76

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Solution

The fourth proportional to 118.38, 163.38 and 71.76 is: 99.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.38 : 163.38 = 71.76 : x
  2. Step 2: Convert to fraction form
    118.38/163.38 = 71.76/x
  3. Step 3: Cross multiply
    118.38x = 163.38 × 71.76
  4. Step 4: Simplify right side
    118.38x = 11,724.15
  5. Step 5: Solve for x
    x = 11,724.15/118.38
  6. Step 6: Final answer
    x = 99.04

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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.