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Finding the Fourth Proportional to 83.87, 124.88 and 80.36

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Solution

The fourth proportional to 83.87, 124.88 and 80.36 is: 119.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.87 : 124.88 = 80.36 : x
  2. Step 2: Convert to fraction form
    83.87/124.88 = 80.36/x
  3. Step 3: Cross multiply
    83.87x = 124.88 × 80.36
  4. Step 4: Simplify right side
    83.87x = 10,034.33
  5. Step 5: Solve for x
    x = 10,034.33/83.87
  6. Step 6: Final answer
    x = 119.65

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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.