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Finding the Fourth Proportional to 395.20, 545.36 and 247.92

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Solution

The fourth proportional to 395.20, 545.36 and 247.92 is: 342.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.20 : 545.36 = 247.92 : x
  2. Step 2: Convert to fraction form
    395.20/545.36 = 247.92/x
  3. Step 3: Cross multiply
    395.20x = 545.36 × 247.92
  4. Step 4: Simplify right side
    395.20x = 135,205.65
  5. Step 5: Solve for x
    x = 135,205.65/395.20
  6. Step 6: Final answer
    x = 342.12

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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.