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Finding the Third Proportional to 1,685.25 and 3,639.75

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Solution

The third proportional to 1,685.25 and 3,639.75 is: 7,861.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,685.25 : 3,639.75 = 3,639.75 : x
  2. Step 2: Convert to fraction form
    1,685.25/3,639.75 = 3,639.75/x
  3. Step 3: Cross multiply
    1,685.25x = 3,639.75 × 3,639.75
  4. Step 4: Simplify right side
    1,685.25x = 13,247,780.06
  5. Step 5: Solve for x
    x = 13,247,780.06/1,685.25
  6. Step 6: Final answer
    x = 7,861.02

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.