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Finding the Fourth Proportional to 395.03, 545.20 and 255.56

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Solution

The fourth proportional to 395.03, 545.20 and 255.56 is: 352.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.03 : 545.20 = 255.56 : x
  2. Step 2: Convert to fraction form
    395.03/545.20 = 255.56/x
  3. Step 3: Cross multiply
    395.03x = 545.20 × 255.56
  4. Step 4: Simplify right side
    395.03x = 139,328.59
  5. Step 5: Solve for x
    x = 139,328.59/395.03
  6. Step 6: Final answer
    x = 352.70

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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.