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Finding the Third Proportional to 1,959 and 3,989

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Solution

The third proportional to 1,959 and 3,989 is: 8,122.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959 : 3,989 = 3,989 : x
  2. Step 2: Convert to fraction form
    1,959/3,989 = 3,989/x
  3. Step 3: Cross multiply
    1,959x = 3,989 × 3,989
  4. Step 4: Simplify right side
    1,959x = 15,912,121
  5. Step 5: Solve for x
    x = 15,912,121/1,959
  6. Step 6: Final answer
    x = 8,122.57

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Why These Related Problems?

These problems maintain the same ratio (2.04) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.