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Finding the Fourth Proportional to 394.10, 543.78 and 238.85

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Solution

The fourth proportional to 394.10, 543.78 and 238.85 is: 329.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.10 : 543.78 = 238.85 : x
  2. Step 2: Convert to fraction form
    394.10/543.78 = 238.85/x
  3. Step 3: Cross multiply
    394.10x = 543.78 × 238.85
  4. Step 4: Simplify right side
    394.10x = 129,881.85
  5. Step 5: Solve for x
    x = 129,881.85/394.10
  6. Step 6: Final answer
    x = 329.57

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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.