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Finding the Third Proportional to 3,930 and 8,900

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Solution

The third proportional to 3,930 and 8,900 is: 20,155.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,930 : 8,900 = 8,900 : x
  2. Step 2: Convert to fraction form
    3,930/8,900 = 8,900/x
  3. Step 3: Cross multiply
    3,930x = 8,900 × 8,900
  4. Step 4: Simplify right side
    3,930x = 79,210,000
  5. Step 5: Solve for x
    x = 79,210,000/3,930
  6. Step 6: Final answer
    x = 20,155.22

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Why These Related Problems?

These problems maintain the same ratio (2.26) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.