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Finding the Fourth Proportional to 254.49, 381.78 and 71.91

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Solution

The fourth proportional to 254.49, 381.78 and 71.91 is: 107.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.49 : 381.78 = 71.91 : x
  2. Step 2: Convert to fraction form
    254.49/381.78 = 71.91/x
  3. Step 3: Cross multiply
    254.49x = 381.78 × 71.91
  4. Step 4: Simplify right side
    254.49x = 27,453.80
  5. Step 5: Solve for x
    x = 27,453.80/254.49
  6. Step 6: Final answer
    x = 107.88

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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.