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Finding the Third Proportional to 399.75 and 617.25

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Solution

The third proportional to 399.75 and 617.25 is: 953.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.75 : 617.25 = 617.25 : x
  2. Step 2: Convert to fraction form
    399.75/617.25 = 617.25/x
  3. Step 3: Cross multiply
    399.75x = 617.25 × 617.25
  4. Step 4: Simplify right side
    399.75x = 380,997.56
  5. Step 5: Solve for x
    x = 380,997.56/399.75
  6. Step 6: Final answer
    x = 953.09

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.