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Finding the Third Proportional to 1,728 and 3,211

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Solution

The third proportional to 1,728 and 3,211 is: 5,966.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,728 : 3,211 = 3,211 : x
  2. Step 2: Convert to fraction form
    1,728/3,211 = 3,211/x
  3. Step 3: Cross multiply
    1,728x = 3,211 × 3,211
  4. Step 4: Simplify right side
    1,728x = 10,310,521
  5. Step 5: Solve for x
    x = 10,310,521/1,728
  6. Step 6: Final answer
    x = 5,966.74

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Why These Related Problems?

These problems maintain the same ratio (1.86) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.