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Finding the Third Proportional to 3,880 and 8,990

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Solution

The third proportional to 3,880 and 8,990 is: 20,829.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,880 : 8,990 = 8,990 : x
  2. Step 2: Convert to fraction form
    3,880/8,990 = 8,990/x
  3. Step 3: Cross multiply
    3,880x = 8,990 × 8,990
  4. Step 4: Simplify right side
    3,880x = 80,820,100
  5. Step 5: Solve for x
    x = 80,820,100/3,880
  6. Step 6: Final answer
    x = 20,829.92

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Why These Related Problems?

These problems maintain the same ratio (2.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.