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Finding the Fourth Proportional to 82.57, 113.11 and 79.49

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Solution

The fourth proportional to 82.57, 113.11 and 79.49 is: 108.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.57 : 113.11 = 79.49 : x
  2. Step 2: Convert to fraction form
    82.57/113.11 = 79.49/x
  3. Step 3: Cross multiply
    82.57x = 113.11 × 79.49
  4. Step 4: Simplify right side
    82.57x = 8,991.03
  5. Step 5: Solve for x
    x = 8,991.03/82.57
  6. Step 6: Final answer
    x = 108.90

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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.