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Finding the Fourth Proportional to 80.60, 110.50 and 80

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Solution

The fourth proportional to 80.60, 110.50 and 80 is: 109.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.60 : 110.50 = 80 : x
  2. Step 2: Convert to fraction form
    80.60/110.50 = 80/x
  3. Step 3: Cross multiply
    80.60x = 110.50 × 80
  4. Step 4: Simplify right side
    80.60x = 8,840
  5. Step 5: Solve for x
    x = 8,840/80.60
  6. Step 6: Final answer
    x = 109.68

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.