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Finding the Fourth Proportional to 418.72, 576.48 and 398.56

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Solution

The fourth proportional to 418.72, 576.48 and 398.56 is: 548.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.72 : 576.48 = 398.56 : x
  2. Step 2: Convert to fraction form
    418.72/576.48 = 398.56/x
  3. Step 3: Cross multiply
    418.72x = 576.48 × 398.56
  4. Step 4: Simplify right side
    418.72x = 229,761.87
  5. Step 5: Solve for x
    x = 229,761.87/418.72
  6. Step 6: Final answer
    x = 548.72

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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.