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Finding the Third Proportional to 687 and 1,021

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Solution

The third proportional to 687 and 1,021 is: 1,517.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    687 : 1,021 = 1,021 : x
  2. Step 2: Convert to fraction form
    687/1,021 = 1,021/x
  3. Step 3: Cross multiply
    687x = 1,021 × 1,021
  4. Step 4: Simplify right side
    687x = 1,042,441
  5. Step 5: Solve for x
    x = 1,042,441/687
  6. Step 6: Final answer
    x = 1,517.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.