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Finding the Third Proportional to 2,940 and 3,990

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Solution

The third proportional to 2,940 and 3,990 is: 5,415

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,940 : 3,990 = 3,990 : x
  2. Step 2: Convert to fraction form
    2,940/3,990 = 3,990/x
  3. Step 3: Cross multiply
    2,940x = 3,990 × 3,990
  4. Step 4: Simplify right side
    2,940x = 15,920,100
  5. Step 5: Solve for x
    x = 15,920,100/2,940
  6. Step 6: Final answer
    x = 5,415

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.