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Finding the Fourth Proportional to 418.09, 576.87 and 243.43

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Solution

The fourth proportional to 418.09, 576.87 and 243.43 is: 335.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.09 : 576.87 = 243.43 : x
  2. Step 2: Convert to fraction form
    418.09/576.87 = 243.43/x
  3. Step 3: Cross multiply
    418.09x = 576.87 × 243.43
  4. Step 4: Simplify right side
    418.09x = 140,427.46
  5. Step 5: Solve for x
    x = 140,427.46/418.09
  6. Step 6: Final answer
    x = 335.88

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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.