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Finding the Fourth Proportional to 255.29, 382.90 and 81.95

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Solution

The fourth proportional to 255.29, 382.90 and 81.95 is: 122.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.29 : 382.90 = 81.95 : x
  2. Step 2: Convert to fraction form
    255.29/382.90 = 81.95/x
  3. Step 3: Cross multiply
    255.29x = 382.90 × 81.95
  4. Step 4: Simplify right side
    255.29x = 31,376.33
  5. Step 5: Solve for x
    x = 31,376.33/255.29
  6. Step 6: Final answer
    x = 122.91

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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.