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Finding the Fourth Proportional to 395.38, 545.85 and 255.70

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Solution

The fourth proportional to 395.38, 545.85 and 255.70 is: 353.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.38 : 545.85 = 255.70 : x
  2. Step 2: Convert to fraction form
    395.38/545.85 = 255.70/x
  3. Step 3: Cross multiply
    395.38x = 545.85 × 255.70
  4. Step 4: Simplify right side
    395.38x = 139,569.84
  5. Step 5: Solve for x
    x = 139,569.84/395.38
  6. Step 6: Final answer
    x = 353.01

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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.