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Finding the Third Proportional to 685.13 and 1,617.75

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Solution

The third proportional to 685.13 and 1,617.75 is: 3,819.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.13 : 1,617.75 = 1,617.75 : x
  2. Step 2: Convert to fraction form
    685.13/1,617.75 = 1,617.75/x
  3. Step 3: Cross multiply
    685.13x = 1,617.75 × 1,617.75
  4. Step 4: Simplify right side
    685.13x = 2,617,115.06
  5. Step 5: Solve for x
    x = 2,617,115.06/685.13
  6. Step 6: Final answer
    x = 3,819.91

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Why These Related Problems?

These problems maintain the same ratio (2.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.