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Finding the Fourth Proportional to 378.39, 522.09 and 254.28

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Solution

The fourth proportional to 378.39, 522.09 and 254.28 is: 350.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.39 : 522.09 = 254.28 : x
  2. Step 2: Convert to fraction form
    378.39/522.09 = 254.28/x
  3. Step 3: Cross multiply
    378.39x = 522.09 × 254.28
  4. Step 4: Simplify right side
    378.39x = 132,757.05
  5. Step 5: Solve for x
    x = 132,757.05/378.39
  6. Step 6: Final answer
    x = 350.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.