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Finding the Fourth Proportional to 395.15, 545.49 and 247.95

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Solution

The fourth proportional to 395.15, 545.49 and 247.95 is: 342.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.15 : 545.49 = 247.95 : x
  2. Step 2: Convert to fraction form
    395.15/545.49 = 247.95/x
  3. Step 3: Cross multiply
    395.15x = 545.49 × 247.95
  4. Step 4: Simplify right side
    395.15x = 135,254.25
  5. Step 5: Solve for x
    x = 135,254.25/395.15
  6. Step 6: Final answer
    x = 342.29

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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.