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Finding the Third Proportional to 9,722 and 12,639

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Solution

The third proportional to 9,722 and 12,639 is: 16,431.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,722 : 12,639 = 12,639 : x
  2. Step 2: Convert to fraction form
    9,722/12,639 = 12,639/x
  3. Step 3: Cross multiply
    9,722x = 12,639 × 12,639
  4. Step 4: Simplify right side
    9,722x = 159,744,321
  5. Step 5: Solve for x
    x = 159,744,321/9,722
  6. Step 6: Final answer
    x = 16,431.22

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.