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Finding the Fourth Proportional to 205.38, 308.07 and 83.62

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Solution

The fourth proportional to 205.38, 308.07 and 83.62 is: 125.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.38 : 308.07 = 83.62 : x
  2. Step 2: Convert to fraction form
    205.38/308.07 = 83.62/x
  3. Step 3: Cross multiply
    205.38x = 308.07 × 83.62
  4. Step 4: Simplify right side
    205.38x = 25,759.27
  5. Step 5: Solve for x
    x = 25,759.27/205.38
  6. Step 6: Final answer
    x = 125.42

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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.