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Finding the Fourth Proportional to 118.39, 163.18 and 81.49

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Solution

The fourth proportional to 118.39, 163.18 and 81.49 is: 112.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.39 : 163.18 = 81.49 : x
  2. Step 2: Convert to fraction form
    118.39/163.18 = 81.49/x
  3. Step 3: Cross multiply
    118.39x = 163.18 × 81.49
  4. Step 4: Simplify right side
    118.39x = 13,296.31
  5. Step 5: Solve for x
    x = 13,296.31/118.39
  6. Step 6: Final answer
    x = 112.31

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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.