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Finding the Fourth Proportional to 81.51, 113.10 and 80.73

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Solution

The fourth proportional to 81.51, 113.10 and 80.73 is: 112.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.51 : 113.10 = 80.73 : x
  2. Step 2: Convert to fraction form
    81.51/113.10 = 80.73/x
  3. Step 3: Cross multiply
    81.51x = 113.10 × 80.73
  4. Step 4: Simplify right side
    81.51x = 9,130.56
  5. Step 5: Solve for x
    x = 9,130.56/81.51
  6. Step 6: Final answer
    x = 112.02

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.