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Finding the Fourth Proportional to 82.46, 113.27 and 66.85

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Solution

The fourth proportional to 82.46, 113.27 and 66.85 is: 91.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.46 : 113.27 = 66.85 : x
  2. Step 2: Convert to fraction form
    82.46/113.27 = 66.85/x
  3. Step 3: Cross multiply
    82.46x = 113.27 × 66.85
  4. Step 4: Simplify right side
    82.46x = 7,572.10
  5. Step 5: Solve for x
    x = 7,572.10/82.46
  6. Step 6: Final answer
    x = 91.83

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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.