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Finding the Third Proportional to 8,718 and 12,421

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Solution

The third proportional to 8,718 and 12,421 is: 17,696.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,718 : 12,421 = 12,421 : x
  2. Step 2: Convert to fraction form
    8,718/12,421 = 12,421/x
  3. Step 3: Cross multiply
    8,718x = 12,421 × 12,421
  4. Step 4: Simplify right side
    8,718x = 154,281,241
  5. Step 5: Solve for x
    x = 154,281,241/8,718
  6. Step 6: Final answer
    x = 17,696.86

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.