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Finding the Third Proportional to 322.78 and 689.44

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Solution

The third proportional to 322.78 and 689.44 is: 1,472.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.78 : 689.44 = 689.44 : x
  2. Step 2: Convert to fraction form
    322.78/689.44 = 689.44/x
  3. Step 3: Cross multiply
    322.78x = 689.44 × 689.44
  4. Step 4: Simplify right side
    322.78x = 475,324.07
  5. Step 5: Solve for x
    x = 475,324.07/322.78
  6. Step 6: Final answer
    x = 1,472.59

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.