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Finding the Fourth Proportional to 198.12, 275.10 and 196.50

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Solution

The fourth proportional to 198.12, 275.10 and 196.50 is: 272.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.12 : 275.10 = 196.50 : x
  2. Step 2: Convert to fraction form
    198.12/275.10 = 196.50/x
  3. Step 3: Cross multiply
    198.12x = 275.10 × 196.50
  4. Step 4: Simplify right side
    198.12x = 54,057.15
  5. Step 5: Solve for x
    x = 54,057.15/198.12
  6. Step 6: Final answer
    x = 272.85

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.