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Finding the Fourth Proportional to 69.20, 104.42 and 60.80

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Solution

The fourth proportional to 69.20, 104.42 and 60.80 is: 91.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.20 : 104.42 = 60.80 : x
  2. Step 2: Convert to fraction form
    69.20/104.42 = 60.80/x
  3. Step 3: Cross multiply
    69.20x = 104.42 × 60.80
  4. Step 4: Simplify right side
    69.20x = 6,348.74
  5. Step 5: Solve for x
    x = 6,348.74/69.20
  6. Step 6: Final answer
    x = 91.74

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.