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Finding the Fourth Proportional to 118.72, 163.67 and 81.81

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Solution

The fourth proportional to 118.72, 163.67 and 81.81 is: 112.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.72 : 163.67 = 81.81 : x
  2. Step 2: Convert to fraction form
    118.72/163.67 = 81.81/x
  3. Step 3: Cross multiply
    118.72x = 163.67 × 81.81
  4. Step 4: Simplify right side
    118.72x = 13,390.58
  5. Step 5: Solve for x
    x = 13,390.58/118.72
  6. Step 6: Final answer
    x = 112.79

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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.