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Finding the Fourth Proportional to 254.27, 381.45 and 80.91

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Solution

The fourth proportional to 254.27, 381.45 and 80.91 is: 121.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.27 : 381.45 = 80.91 : x
  2. Step 2: Convert to fraction form
    254.27/381.45 = 80.91/x
  3. Step 3: Cross multiply
    254.27x = 381.45 × 80.91
  4. Step 4: Simplify right side
    254.27x = 30,863.12
  5. Step 5: Solve for x
    x = 30,863.12/254.27
  6. Step 6: Final answer
    x = 121.38

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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.