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Finding the Fourth Proportional to 397.35, 548.31 and 255.39

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Solution

The fourth proportional to 397.35, 548.31 and 255.39 is: 352.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.35 : 548.31 = 255.39 : x
  2. Step 2: Convert to fraction form
    397.35/548.31 = 255.39/x
  3. Step 3: Cross multiply
    397.35x = 548.31 × 255.39
  4. Step 4: Simplify right side
    397.35x = 140,032.89
  5. Step 5: Solve for x
    x = 140,032.89/397.35
  6. Step 6: Final answer
    x = 352.42

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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.