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Finding the Fourth Proportional to 118.55, 163.61 and 69.42

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Solution

The fourth proportional to 118.55, 163.61 and 69.42 is: 95.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.55 : 163.61 = 69.42 : x
  2. Step 2: Convert to fraction form
    118.55/163.61 = 69.42/x
  3. Step 3: Cross multiply
    118.55x = 163.61 × 69.42
  4. Step 4: Simplify right side
    118.55x = 11,358.33
  5. Step 5: Solve for x
    x = 11,358.33/118.55
  6. Step 6: Final answer
    x = 95.81

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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.