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Finding the Third Proportional to 198.75 and 275.25

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Solution

The third proportional to 198.75 and 275.25 is: 381.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.75 : 275.25 = 275.25 : x
  2. Step 2: Convert to fraction form
    198.75/275.25 = 275.25/x
  3. Step 3: Cross multiply
    198.75x = 275.25 × 275.25
  4. Step 4: Simplify right side
    198.75x = 75,762.56
  5. Step 5: Solve for x
    x = 75,762.56/198.75
  6. Step 6: Final answer
    x = 381.20

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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.