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Finding the Fourth Proportional to 254.34, 381.36 and 80.97

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Solution

The fourth proportional to 254.34, 381.36 and 80.97 is: 121.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.34 : 381.36 = 80.97 : x
  2. Step 2: Convert to fraction form
    254.34/381.36 = 80.97/x
  3. Step 3: Cross multiply
    254.34x = 381.36 × 80.97
  4. Step 4: Simplify right side
    254.34x = 30,879.20
  5. Step 5: Solve for x
    x = 30,879.20/254.34
  6. Step 6: Final answer
    x = 121.41

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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.