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Finding the Fourth Proportional to 83.26, 114.79 and 66.85

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Solution

The fourth proportional to 83.26, 114.79 and 66.85 is: 92.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.26 : 114.79 = 66.85 : x
  2. Step 2: Convert to fraction form
    83.26/114.79 = 66.85/x
  3. Step 3: Cross multiply
    83.26x = 114.79 × 66.85
  4. Step 4: Simplify right side
    83.26x = 7,673.71
  5. Step 5: Solve for x
    x = 7,673.71/83.26
  6. Step 6: Final answer
    x = 92.17

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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.