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Finding the Fourth Proportional to 395.13, 545.21 and 247.71

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Solution

The fourth proportional to 395.13, 545.21 and 247.71 is: 341.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.13 : 545.21 = 247.71 : x
  2. Step 2: Convert to fraction form
    395.13/545.21 = 247.71/x
  3. Step 3: Cross multiply
    395.13x = 545.21 × 247.71
  4. Step 4: Simplify right side
    395.13x = 135,052.73
  5. Step 5: Solve for x
    x = 135,052.73/395.13
  6. Step 6: Final answer
    x = 341.79

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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.