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Finding the Third Proportional to 680.75 and 1,309.75

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Solution

The third proportional to 680.75 and 1,309.75 is: 2,519.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.75 : 1,309.75 = 1,309.75 : x
  2. Step 2: Convert to fraction form
    680.75/1,309.75 = 1,309.75/x
  3. Step 3: Cross multiply
    680.75x = 1,309.75 × 1,309.75
  4. Step 4: Simplify right side
    680.75x = 1,715,445.06
  5. Step 5: Solve for x
    x = 1,715,445.06/680.75
  6. Step 6: Final answer
    x = 2,519.93

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Why These Related Problems?

These problems maintain the same ratio (1.92) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.