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Finding the Third Proportional to 1,380 and 1,568

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Solution

The third proportional to 1,380 and 1,568 is: 1,781.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380 : 1,568 = 1,568 : x
  2. Step 2: Convert to fraction form
    1,380/1,568 = 1,568/x
  3. Step 3: Cross multiply
    1,380x = 1,568 × 1,568
  4. Step 4: Simplify right side
    1,380x = 2,458,624
  5. Step 5: Solve for x
    x = 2,458,624/1,380
  6. Step 6: Final answer
    x = 1,781.61

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Why These Related Problems?

These problems maintain the same ratio (1.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.