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Finding the Third Proportional to 678 and 1,568

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Solution

The third proportional to 678 and 1,568 is: 3,626.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    678 : 1,568 = 1,568 : x
  2. Step 2: Convert to fraction form
    678/1,568 = 1,568/x
  3. Step 3: Cross multiply
    678x = 1,568 × 1,568
  4. Step 4: Simplify right side
    678x = 2,458,624
  5. Step 5: Solve for x
    x = 2,458,624/678
  6. Step 6: Final answer
    x = 3,626.29

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Why These Related Problems?

These problems maintain the same ratio (2.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.