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Finding the Fourth Proportional to 386.31, 532.92 and 255.09

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Solution

The fourth proportional to 386.31, 532.92 and 255.09 is: 351.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.31 : 532.92 = 255.09 : x
  2. Step 2: Convert to fraction form
    386.31/532.92 = 255.09/x
  3. Step 3: Cross multiply
    386.31x = 532.92 × 255.09
  4. Step 4: Simplify right side
    386.31x = 135,942.56
  5. Step 5: Solve for x
    x = 135,942.56/386.31
  6. Step 6: Final answer
    x = 351.90

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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.