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Finding the Fourth Proportional to 394.92, 545.04 and 239.67

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Solution

The fourth proportional to 394.92, 545.04 and 239.67 is: 330.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.92 : 545.04 = 239.67 : x
  2. Step 2: Convert to fraction form
    394.92/545.04 = 239.67/x
  3. Step 3: Cross multiply
    394.92x = 545.04 × 239.67
  4. Step 4: Simplify right side
    394.92x = 130,629.74
  5. Step 5: Solve for x
    x = 130,629.74/394.92
  6. Step 6: Final answer
    x = 330.78

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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.