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Finding the Third Proportional to 3,120 and 6,138.75

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Solution

The third proportional to 3,120 and 6,138.75 is: 12,078.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,120 : 6,138.75 = 6,138.75 : x
  2. Step 2: Convert to fraction form
    3,120/6,138.75 = 6,138.75/x
  3. Step 3: Cross multiply
    3,120x = 6,138.75 × 6,138.75
  4. Step 4: Simplify right side
    3,120x = 37,684,251.56
  5. Step 5: Solve for x
    x = 37,684,251.56/3,120
  6. Step 6: Final answer
    x = 12,078.29

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Why These Related Problems?

These problems maintain the same ratio (1.97) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.