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Finding the Fourth Proportional to 82.62, 113.36 and 80.78

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Solution

The fourth proportional to 82.62, 113.36 and 80.78 is: 110.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.62 : 113.36 = 80.78 : x
  2. Step 2: Convert to fraction form
    82.62/113.36 = 80.78/x
  3. Step 3: Cross multiply
    82.62x = 113.36 × 80.78
  4. Step 4: Simplify right side
    82.62x = 9,156.25
  5. Step 5: Solve for x
    x = 9,156.25/82.62
  6. Step 6: Final answer
    x = 110.82

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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.