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Finding the Fourth Proportional to 83.22, 125.11 and 66.31

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Solution

The fourth proportional to 83.22, 125.11 and 66.31 is: 99.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.22 : 125.11 = 66.31 : x
  2. Step 2: Convert to fraction form
    83.22/125.11 = 66.31/x
  3. Step 3: Cross multiply
    83.22x = 125.11 × 66.31
  4. Step 4: Simplify right side
    83.22x = 8,296.04
  5. Step 5: Solve for x
    x = 8,296.04/83.22
  6. Step 6: Final answer
    x = 99.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.