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Finding the Fourth Proportional to 395.17, 545.09 and 255.06

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Solution

The fourth proportional to 395.17, 545.09 and 255.06 is: 351.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.17 : 545.09 = 255.06 : x
  2. Step 2: Convert to fraction form
    395.17/545.09 = 255.06/x
  3. Step 3: Cross multiply
    395.17x = 545.09 × 255.06
  4. Step 4: Simplify right side
    395.17x = 139,030.66
  5. Step 5: Solve for x
    x = 139,030.66/395.17
  6. Step 6: Final answer
    x = 351.83

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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.