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Finding the Third Proportional to 687 and 1,512

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Solution

The third proportional to 687 and 1,512 is: 3,327.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    687 : 1,512 = 1,512 : x
  2. Step 2: Convert to fraction form
    687/1,512 = 1,512/x
  3. Step 3: Cross multiply
    687x = 1,512 × 1,512
  4. Step 4: Simplify right side
    687x = 2,286,144
  5. Step 5: Solve for x
    x = 2,286,144/687
  6. Step 6: Final answer
    x = 3,327.72

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.