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Finding the Third Proportional to 7,721 and 16,639

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Solution

The third proportional to 7,721 and 16,639 is: 35,857.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,721 : 16,639 = 16,639 : x
  2. Step 2: Convert to fraction form
    7,721/16,639 = 16,639/x
  3. Step 3: Cross multiply
    7,721x = 16,639 × 16,639
  4. Step 4: Simplify right side
    7,721x = 276,856,321
  5. Step 5: Solve for x
    x = 276,856,321/7,721
  6. Step 6: Final answer
    x = 35,857.57

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.