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Finding the Third Proportional to 4,990 and 6,649

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Solution

The third proportional to 4,990 and 6,649 is: 8,859.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,990 : 6,649 = 6,649 : x
  2. Step 2: Convert to fraction form
    4,990/6,649 = 6,649/x
  3. Step 3: Cross multiply
    4,990x = 6,649 × 6,649
  4. Step 4: Simplify right side
    4,990x = 44,209,201
  5. Step 5: Solve for x
    x = 44,209,201/4,990
  6. Step 6: Final answer
    x = 8,859.56

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.