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Finding the Fourth Proportional to 118.21, 163.18 and 81.56

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Solution

The fourth proportional to 118.21, 163.18 and 81.56 is: 112.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.21 : 163.18 = 81.56 : x
  2. Step 2: Convert to fraction form
    118.21/163.18 = 81.56/x
  3. Step 3: Cross multiply
    118.21x = 163.18 × 81.56
  4. Step 4: Simplify right side
    118.21x = 13,308.96
  5. Step 5: Solve for x
    x = 13,308.96/118.21
  6. Step 6: Final answer
    x = 112.59

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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.