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Finding the Third Proportional to 399.75 and 539.25

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Solution

The third proportional to 399.75 and 539.25 is: 727.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.75 : 539.25 = 539.25 : x
  2. Step 2: Convert to fraction form
    399.75/539.25 = 539.25/x
  3. Step 3: Cross multiply
    399.75x = 539.25 × 539.25
  4. Step 4: Simplify right side
    399.75x = 290,790.56
  5. Step 5: Solve for x
    x = 290,790.56/399.75
  6. Step 6: Final answer
    x = 727.43

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.