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Finding the Third Proportional to 2,686 and 6,491

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Solution

The third proportional to 2,686 and 6,491 is: 15,686.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,686 : 6,491 = 6,491 : x
  2. Step 2: Convert to fraction form
    2,686/6,491 = 6,491/x
  3. Step 3: Cross multiply
    2,686x = 6,491 × 6,491
  4. Step 4: Simplify right side
    2,686x = 42,133,081
  5. Step 5: Solve for x
    x = 42,133,081/2,686
  6. Step 6: Final answer
    x = 15,686.18

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Why These Related Problems?

These problems maintain the same ratio (2.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.