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Finding the Fourth Proportional to 394.87, 545.09 and 247.47

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Solution

The fourth proportional to 394.87, 545.09 and 247.47 is: 341.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.87 : 545.09 = 247.47 : x
  2. Step 2: Convert to fraction form
    394.87/545.09 = 247.47/x
  3. Step 3: Cross multiply
    394.87x = 545.09 × 247.47
  4. Step 4: Simplify right side
    394.87x = 134,892.18
  5. Step 5: Solve for x
    x = 134,892.18/394.87
  6. Step 6: Final answer
    x = 341.61

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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.