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Finding the Fourth Proportional to 80, 110.60 and 76.60

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Solution

The fourth proportional to 80, 110.60 and 76.60 is: 105.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    80 : 110.60 = 76.60 : x
  2. Step 2: Convert to fraction form
    80/110.60 = 76.60/x
  3. Step 3: Cross multiply
    80x = 110.60 × 76.60
  4. Step 4: Simplify right side
    80x = 8,471.96
  5. Step 5: Solve for x
    x = 8,471.96/80
  6. Step 6: Final answer
    x = 105.90

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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.