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Finding the Third Proportional to 1,989 and 3,906

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Solution

The third proportional to 1,989 and 3,906 is: 7,670.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989 : 3,906 = 3,906 : x
  2. Step 2: Convert to fraction form
    1,989/3,906 = 3,906/x
  3. Step 3: Cross multiply
    1,989x = 3,906 × 3,906
  4. Step 4: Simplify right side
    1,989x = 15,256,836
  5. Step 5: Solve for x
    x = 15,256,836/1,989
  6. Step 6: Final answer
    x = 7,670.61

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Why These Related Problems?

These problems maintain the same ratio (1.96) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.