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Finding the Fourth Proportional to 82.26, 113.30 and 66.78

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Solution

The fourth proportional to 82.26, 113.30 and 66.78 is: 91.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.26 : 113.30 = 66.78 : x
  2. Step 2: Convert to fraction form
    82.26/113.30 = 66.78/x
  3. Step 3: Cross multiply
    82.26x = 113.30 × 66.78
  4. Step 4: Simplify right side
    82.26x = 7,565.84
  5. Step 5: Solve for x
    x = 7,565.84/82.26
  6. Step 6: Final answer
    x = 91.97

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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.