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Finding the Third Proportional to 7,878 and 12,195

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Solution

The third proportional to 7,878 and 12,195 is: 18,877.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,878 : 12,195 = 12,195 : x
  2. Step 2: Convert to fraction form
    7,878/12,195 = 12,195/x
  3. Step 3: Cross multiply
    7,878x = 12,195 × 12,195
  4. Step 4: Simplify right side
    7,878x = 148,718,025
  5. Step 5: Solve for x
    x = 148,718,025/7,878
  6. Step 6: Final answer
    x = 18,877.64

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.