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Finding the Fourth Proportional to 81.80, 112.98 and 80.12

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Solution

The fourth proportional to 81.80, 112.98 and 80.12 is: 110.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.80 : 112.98 = 80.12 : x
  2. Step 2: Convert to fraction form
    81.80/112.98 = 80.12/x
  3. Step 3: Cross multiply
    81.80x = 112.98 × 80.12
  4. Step 4: Simplify right side
    81.80x = 9,051.96
  5. Step 5: Solve for x
    x = 9,051.96/81.80
  6. Step 6: Final answer
    x = 110.66

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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.