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Finding the Fourth Proportional to 254.15, 381.05 and 80.76

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Solution

The fourth proportional to 254.15, 381.05 and 80.76 is: 121.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.15 : 381.05 = 80.76 : x
  2. Step 2: Convert to fraction form
    254.15/381.05 = 80.76/x
  3. Step 3: Cross multiply
    254.15x = 381.05 × 80.76
  4. Step 4: Simplify right side
    254.15x = 30,773.19
  5. Step 5: Solve for x
    x = 30,773.19/254.15
  6. Step 6: Final answer
    x = 121.09

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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.