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Finding the Fourth Proportional to 394.08, 543.78 and 219.40

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Solution

The fourth proportional to 394.08, 543.78 and 219.40 is: 302.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.08 : 543.78 = 219.40 : x
  2. Step 2: Convert to fraction form
    394.08/543.78 = 219.40/x
  3. Step 3: Cross multiply
    394.08x = 543.78 × 219.40
  4. Step 4: Simplify right side
    394.08x = 119,305.33
  5. Step 5: Solve for x
    x = 119,305.33/394.08
  6. Step 6: Final answer
    x = 302.74

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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.