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Finding the Third Proportional to 8,990 and 18,880

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Solution

The third proportional to 8,990 and 18,880 is: 39,650.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,990 : 18,880 = 18,880 : x
  2. Step 2: Convert to fraction form
    8,990/18,880 = 18,880/x
  3. Step 3: Cross multiply
    8,990x = 18,880 × 18,880
  4. Step 4: Simplify right side
    8,990x = 356,454,400
  5. Step 5: Solve for x
    x = 356,454,400/8,990
  6. Step 6: Final answer
    x = 39,650.10

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.