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Finding the Third Proportional to 687 and 827

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Solution

The third proportional to 687 and 827 is: 995.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    687 : 827 = 827 : x
  2. Step 2: Convert to fraction form
    687/827 = 827/x
  3. Step 3: Cross multiply
    687x = 827 × 827
  4. Step 4: Simplify right side
    687x = 683,929
  5. Step 5: Solve for x
    x = 683,929/687
  6. Step 6: Final answer
    x = 995.53

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Why These Related Problems?

These problems maintain the same ratio (1.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.