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Finding the Third Proportional to 8,115 and 12,858

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Solution

The third proportional to 8,115 and 12,858 is: 20,373.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,115 : 12,858 = 12,858 : x
  2. Step 2: Convert to fraction form
    8,115/12,858 = 12,858/x
  3. Step 3: Cross multiply
    8,115x = 12,858 × 12,858
  4. Step 4: Simplify right side
    8,115x = 165,328,164
  5. Step 5: Solve for x
    x = 165,328,164/8,115
  6. Step 6: Final answer
    x = 20,373.16

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.