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Finding the Fourth Proportional to 395.31, 545.42 and 255.43

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Solution

The fourth proportional to 395.31, 545.42 and 255.43 is: 352.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.31 : 545.42 = 255.43 : x
  2. Step 2: Convert to fraction form
    395.31/545.42 = 255.43/x
  3. Step 3: Cross multiply
    395.31x = 545.42 × 255.43
  4. Step 4: Simplify right side
    395.31x = 139,315.35
  5. Step 5: Solve for x
    x = 139,315.35/395.31
  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.