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Finding the Third Proportional to 687 and 1,707

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Solution

The third proportional to 687 and 1,707 is: 4,241.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    687 : 1,707 = 1,707 : x
  2. Step 2: Convert to fraction form
    687/1,707 = 1,707/x
  3. Step 3: Cross multiply
    687x = 1,707 × 1,707
  4. Step 4: Simplify right side
    687x = 2,913,849
  5. Step 5: Solve for x
    x = 2,913,849/687
  6. Step 6: Final answer
    x = 4,241.41

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Why These Related Problems?

These problems maintain the same ratio (2.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.