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Finding the Fourth Proportional to 254.15, 381.20 and 80.81

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Solution

The fourth proportional to 254.15, 381.20 and 80.81 is: 121.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.15 : 381.20 = 80.81 : x
  2. Step 2: Convert to fraction form
    254.15/381.20 = 80.81/x
  3. Step 3: Cross multiply
    254.15x = 381.20 × 80.81
  4. Step 4: Simplify right side
    254.15x = 30,805.32
  5. Step 5: Solve for x
    x = 30,805.32/254.15
  6. Step 6: Final answer
    x = 121.21

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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.