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Finding the Fourth Proportional to 255.12, 382.69 and 81.79

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Solution

The fourth proportional to 255.12, 382.69 and 81.79 is: 122.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.12 : 382.69 = 81.79 : x
  2. Step 2: Convert to fraction form
    255.12/382.69 = 81.79/x
  3. Step 3: Cross multiply
    255.12x = 382.69 × 81.79
  4. Step 4: Simplify right side
    255.12x = 31,301.05
  5. Step 5: Solve for x
    x = 31,301.05/255.12
  6. Step 6: Final answer
    x = 122.69

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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.