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Finding the Fourth Proportional to 83.22, 124.20 and 81.06

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Solution

The fourth proportional to 83.22, 124.20 and 81.06 is: 120.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.22 : 124.20 = 81.06 : x
  2. Step 2: Convert to fraction form
    83.22/124.20 = 81.06/x
  3. Step 3: Cross multiply
    83.22x = 124.20 × 81.06
  4. Step 4: Simplify right side
    83.22x = 10,067.65
  5. Step 5: Solve for x
    x = 10,067.65/83.22
  6. Step 6: Final answer
    x = 120.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.