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Finding the Third Proportional to 1,728 and 3,690

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Solution

The third proportional to 1,728 and 3,690 is: 7,879.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,728 : 3,690 = 3,690 : x
  2. Step 2: Convert to fraction form
    1,728/3,690 = 3,690/x
  3. Step 3: Cross multiply
    1,728x = 3,690 × 3,690
  4. Step 4: Simplify right side
    1,728x = 13,616,100
  5. Step 5: Solve for x
    x = 13,616,100/1,728
  6. Step 6: Final answer
    x = 7,879.69

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.