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Finding the Fourth Proportional to 118.18, 163.14 and 76.80

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Solution

The fourth proportional to 118.18, 163.14 and 76.80 is: 106.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.18 : 163.14 = 76.80 : x
  2. Step 2: Convert to fraction form
    118.18/163.14 = 76.80/x
  3. Step 3: Cross multiply
    118.18x = 163.14 × 76.80
  4. Step 4: Simplify right side
    118.18x = 12,529.15
  5. Step 5: Solve for x
    x = 12,529.15/118.18
  6. Step 6: Final answer
    x = 106.02

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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.