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Finding the Third Proportional to 4,212 and 6,990

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Solution

The third proportional to 4,212 and 6,990 is: 11,600.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,212 : 6,990 = 6,990 : x
  2. Step 2: Convert to fraction form
    4,212/6,990 = 6,990/x
  3. Step 3: Cross multiply
    4,212x = 6,990 × 6,990
  4. Step 4: Simplify right side
    4,212x = 48,860,100
  5. Step 5: Solve for x
    x = 48,860,100/4,212
  6. Step 6: Final answer
    x = 11,600.21

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Why These Related Problems?

These problems maintain the same ratio (1.66) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.