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Finding the Fourth Proportional to 255.38, 382.92 and 82

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Solution

The fourth proportional to 255.38, 382.92 and 82 is: 122.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.38 : 382.92 = 82 : x
  2. Step 2: Convert to fraction form
    255.38/382.92 = 82/x
  3. Step 3: Cross multiply
    255.38x = 382.92 × 82
  4. Step 4: Simplify right side
    255.38x = 31,399.44
  5. Step 5: Solve for x
    x = 31,399.44/255.38
  6. Step 6: Final answer
    x = 122.95

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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.