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Finding the Third Proportional to 1,690.03 and 3,640.78

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Solution

The third proportional to 1,690.03 and 3,640.78 is: 7,843.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,690.03 : 3,640.78 = 3,640.78 : x
  2. Step 2: Convert to fraction form
    1,690.03/3,640.78 = 3,640.78/x
  3. Step 3: Cross multiply
    1,690.03x = 3,640.78 × 3,640.78
  4. Step 4: Simplify right side
    1,690.03x = 13,255,288.11
  5. Step 5: Solve for x
    x = 13,255,288.11/1,690.03
  6. Step 6: Final answer
    x = 7,843.22

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.