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Finding the Third Proportional to 2,186 and 3,900

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Solution

The third proportional to 2,186 and 3,900 is: 6,957.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,186 : 3,900 = 3,900 : x
  2. Step 2: Convert to fraction form
    2,186/3,900 = 3,900/x
  3. Step 3: Cross multiply
    2,186x = 3,900 × 3,900
  4. Step 4: Simplify right side
    2,186x = 15,210,000
  5. Step 5: Solve for x
    x = 15,210,000/2,186
  6. Step 6: Final answer
    x = 6,957.91

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.