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Finding the Third Proportional to 1,678 and 3,913

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Solution

The third proportional to 1,678 and 3,913 is: 9,124.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678 : 3,913 = 3,913 : x
  2. Step 2: Convert to fraction form
    1,678/3,913 = 3,913/x
  3. Step 3: Cross multiply
    1,678x = 3,913 × 3,913
  4. Step 4: Simplify right side
    1,678x = 15,311,569
  5. Step 5: Solve for x
    x = 15,311,569/1,678
  6. Step 6: Final answer
    x = 9,124.89

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Why These Related Problems?

These problems maintain the same ratio (2.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.