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Finding the Third Proportional to 299.75 and 645.25

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Solution

The third proportional to 299.75 and 645.25 is: 1,388.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.75 : 645.25 = 645.25 : x
  2. Step 2: Convert to fraction form
    299.75/645.25 = 645.25/x
  3. Step 3: Cross multiply
    299.75x = 645.25 × 645.25
  4. Step 4: Simplify right side
    299.75x = 416,347.56
  5. Step 5: Solve for x
    x = 416,347.56/299.75
  6. Step 6: Final answer
    x = 1,388.98

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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.