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Finding the Third Proportional to 189 and 217.25

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Solution

The third proportional to 189 and 217.25 is: 249.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    189 : 217.25 = 217.25 : x
  2. Step 2: Convert to fraction form
    189/217.25 = 217.25/x
  3. Step 3: Cross multiply
    189x = 217.25 × 217.25
  4. Step 4: Simplify right side
    189x = 47,197.56
  5. Step 5: Solve for x
    x = 47,197.56/189
  6. Step 6: Final answer
    x = 249.72

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.