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Finding the Fourth Proportional to 118.59, 163.68 and 77.20

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Solution

The fourth proportional to 118.59, 163.68 and 77.20 is: 106.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.59 : 163.68 = 77.20 : x
  2. Step 2: Convert to fraction form
    118.59/163.68 = 77.20/x
  3. Step 3: Cross multiply
    118.59x = 163.68 × 77.20
  4. Step 4: Simplify right side
    118.59x = 12,636.10
  5. Step 5: Solve for x
    x = 12,636.10/118.59
  6. Step 6: Final answer
    x = 106.55

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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.