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Finding the Fourth Proportional to 415.33, 622.59 and 198.79

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Solution

The fourth proportional to 415.33, 622.59 and 198.79 is: 297.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.33 : 622.59 = 198.79 : x
  2. Step 2: Convert to fraction form
    415.33/622.59 = 198.79/x
  3. Step 3: Cross multiply
    415.33x = 622.59 × 198.79
  4. Step 4: Simplify right side
    415.33x = 123,765.44
  5. Step 5: Solve for x
    x = 123,765.44/415.33
  6. Step 6: Final answer
    x = 297.99

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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.