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Finding the Third Proportional to 1,389 and 2,112

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Solution

The third proportional to 1,389 and 2,112 is: 3,211.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389 : 2,112 = 2,112 : x
  2. Step 2: Convert to fraction form
    1,389/2,112 = 2,112/x
  3. Step 3: Cross multiply
    1,389x = 2,112 × 2,112
  4. Step 4: Simplify right side
    1,389x = 4,460,544
  5. Step 5: Solve for x
    x = 4,460,544/1,389
  6. Step 6: Final answer
    x = 3,211.33

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.