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Finding the Fourth Proportional to 205.38, 308.19 and 83.66

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Solution

The fourth proportional to 205.38, 308.19 and 83.66 is: 125.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.38 : 308.19 = 83.66 : x
  2. Step 2: Convert to fraction form
    205.38/308.19 = 83.66/x
  3. Step 3: Cross multiply
    205.38x = 308.19 × 83.66
  4. Step 4: Simplify right side
    205.38x = 25,781.63
  5. Step 5: Solve for x
    x = 25,781.63/205.38
  6. Step 6: Final answer
    x = 125.53

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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.