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Finding the Third Proportional to 9,930 and 21,639

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Solution

The third proportional to 9,930 and 21,639 is: 47,154.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,930 : 21,639 = 21,639 : x
  2. Step 2: Convert to fraction form
    9,930/21,639 = 21,639/x
  3. Step 3: Cross multiply
    9,930x = 21,639 × 21,639
  4. Step 4: Simplify right side
    9,930x = 468,246,321
  5. Step 5: Solve for x
    x = 468,246,321/9,930
  6. Step 6: Final answer
    x = 47,154.72

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.