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Finding the Third Proportional to 1,680 and 3,891

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Solution

The third proportional to 1,680 and 3,891 is: 9,011.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680 : 3,891 = 3,891 : x
  2. Step 2: Convert to fraction form
    1,680/3,891 = 3,891/x
  3. Step 3: Cross multiply
    1,680x = 3,891 × 3,891
  4. Step 4: Simplify right side
    1,680x = 15,139,881
  5. Step 5: Solve for x
    x = 15,139,881/1,680
  6. Step 6: Final answer
    x = 9,011.83

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Why These Related Problems?

These problems maintain the same ratio (2.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.