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Finding the Third Proportional to 6,400 and 11,990

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Solution

The third proportional to 6,400 and 11,990 is: 22,462.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,400 : 11,990 = 11,990 : x
  2. Step 2: Convert to fraction form
    6,400/11,990 = 11,990/x
  3. Step 3: Cross multiply
    6,400x = 11,990 × 11,990
  4. Step 4: Simplify right side
    6,400x = 143,760,100
  5. Step 5: Solve for x
    x = 143,760,100/6,400
  6. Step 6: Final answer
    x = 22,462.52

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Why These Related Problems?

These problems maintain the same ratio (1.87) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.