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Finding the Third Proportional to 687.22 and 1,398.44

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Solution

The third proportional to 687.22 and 1,398.44 is: 2,845.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.22 : 1,398.44 = 1,398.44 : x
  2. Step 2: Convert to fraction form
    687.22/1,398.44 = 1,398.44/x
  3. Step 3: Cross multiply
    687.22x = 1,398.44 × 1,398.44
  4. Step 4: Simplify right side
    687.22x = 1,955,627.44
  5. Step 5: Solve for x
    x = 1,955,627.44/687.22
  6. Step 6: Final answer
    x = 2,845.71

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Why These Related Problems?

These problems maintain the same ratio (2.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.