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Finding the Third Proportional to 269.26 and 422.72

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Solution

The third proportional to 269.26 and 422.72 is: 663.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.26 : 422.72 = 422.72 : x
  2. Step 2: Convert to fraction form
    269.26/422.72 = 422.72/x
  3. Step 3: Cross multiply
    269.26x = 422.72 × 422.72
  4. Step 4: Simplify right side
    269.26x = 178,691.14
  5. Step 5: Solve for x
    x = 178,691.14/269.26
  6. Step 6: Final answer
    x = 663.63

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.