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Finding the Fourth Proportional to 83.19, 114.20 and 81.66

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Solution

The fourth proportional to 83.19, 114.20 and 81.66 is: 112.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.19 : 114.20 = 81.66 : x
  2. Step 2: Convert to fraction form
    83.19/114.20 = 81.66/x
  3. Step 3: Cross multiply
    83.19x = 114.20 × 81.66
  4. Step 4: Simplify right side
    83.19x = 9,325.16
  5. Step 5: Solve for x
    x = 9,325.16/83.19
  6. Step 6: Final answer
    x = 112.09

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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.