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Finding the Fourth Proportional to 300.78, 415.11 and 196.02

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Solution

The fourth proportional to 300.78, 415.11 and 196.02 is: 270.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.78 : 415.11 = 196.02 : x
  2. Step 2: Convert to fraction form
    300.78/415.11 = 196.02/x
  3. Step 3: Cross multiply
    300.78x = 415.11 × 196.02
  4. Step 4: Simplify right side
    300.78x = 81,369.86
  5. Step 5: Solve for x
    x = 81,369.86/300.78
  6. Step 6: Final answer
    x = 270.53

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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.