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Finding the Third Proportional to 198.98 and 308.53

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Solution

The third proportional to 198.98 and 308.53 is: 478.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.98 : 308.53 = 308.53 : x
  2. Step 2: Convert to fraction form
    198.98/308.53 = 308.53/x
  3. Step 3: Cross multiply
    198.98x = 308.53 × 308.53
  4. Step 4: Simplify right side
    198.98x = 95,191.53
  5. Step 5: Solve for x
    x = 95,191.53/198.98
  6. Step 6: Final answer
    x = 478.39

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.