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Finding the Third Proportional to 272.11 and 422.09

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Solution

The third proportional to 272.11 and 422.09 is: 654.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.11 : 422.09 = 422.09 : x
  2. Step 2: Convert to fraction form
    272.11/422.09 = 422.09/x
  3. Step 3: Cross multiply
    272.11x = 422.09 × 422.09
  4. Step 4: Simplify right side
    272.11x = 178,156.54
  5. Step 5: Solve for x
    x = 178,156.54/272.11
  6. Step 6: Final answer
    x = 654.72

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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.