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Finding the Fourth Proportional to 83.88, 125.33 and 81

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Solution

The fourth proportional to 83.88, 125.33 and 81 is: 121.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.88 : 125.33 = 81 : x
  2. Step 2: Convert to fraction form
    83.88/125.33 = 81/x
  3. Step 3: Cross multiply
    83.88x = 125.33 × 81
  4. Step 4: Simplify right side
    83.88x = 10,151.33
  5. Step 5: Solve for x
    x = 10,151.33/83.88
  6. Step 6: Final answer
    x = 121.02

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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.