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Finding the Fourth Proportional to 414.88, 621.90 and 198.28

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Solution

The fourth proportional to 414.88, 621.90 and 198.28 is: 297.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.88 : 621.90 = 198.28 : x
  2. Step 2: Convert to fraction form
    414.88/621.90 = 198.28/x
  3. Step 3: Cross multiply
    414.88x = 621.90 × 198.28
  4. Step 4: Simplify right side
    414.88x = 123,310.33
  5. Step 5: Solve for x
    x = 123,310.33/414.88
  6. Step 6: Final answer
    x = 297.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.