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Finding the Third Proportional to 3,840 and 6,840

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Solution

The third proportional to 3,840 and 6,840 is: 12,183.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,840 : 6,840 = 6,840 : x
  2. Step 2: Convert to fraction form
    3,840/6,840 = 6,840/x
  3. Step 3: Cross multiply
    3,840x = 6,840 × 6,840
  4. Step 4: Simplify right side
    3,840x = 46,785,600
  5. Step 5: Solve for x
    x = 46,785,600/3,840
  6. Step 6: Final answer
    x = 12,183.75

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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.