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Finding the Third Proportional to 515.50 and 629.50

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Solution

The third proportional to 515.50 and 629.50 is: 768.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.50 : 629.50 = 629.50 : x
  2. Step 2: Convert to fraction form
    515.50/629.50 = 629.50/x
  3. Step 3: Cross multiply
    515.50x = 629.50 × 629.50
  4. Step 4: Simplify right side
    515.50x = 396,270.25
  5. Step 5: Solve for x
    x = 396,270.25/515.50
  6. Step 6: Final answer
    x = 768.71

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Why These Related Problems?

These problems maintain the same ratio (1.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.