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Finding the Fourth Proportional to 83.69, 125.25 and 74.69

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Solution

The fourth proportional to 83.69, 125.25 and 74.69 is: 111.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.69 : 125.25 = 74.69 : x
  2. Step 2: Convert to fraction form
    83.69/125.25 = 74.69/x
  3. Step 3: Cross multiply
    83.69x = 125.25 × 74.69
  4. Step 4: Simplify right side
    83.69x = 9,354.92
  5. Step 5: Solve for x
    x = 9,354.92/83.69
  6. Step 6: Final answer
    x = 111.78

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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.