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Finding the Fourth Proportional to 415.03, 622.55 and 198.49

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Solution

The fourth proportional to 415.03, 622.55 and 198.49 is: 297.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.03 : 622.55 = 198.49 : x
  2. Step 2: Convert to fraction form
    415.03/622.55 = 198.49/x
  3. Step 3: Cross multiply
    415.03x = 622.55 × 198.49
  4. Step 4: Simplify right side
    415.03x = 123,569.95
  5. Step 5: Solve for x
    x = 123,569.95/415.03
  6. Step 6: Final answer
    x = 297.74

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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.