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Finding the Third Proportional to 408.50 and 720.25

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Solution

The third proportional to 408.50 and 720.25 is: 1,269.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.50 : 720.25 = 720.25 : x
  2. Step 2: Convert to fraction form
    408.50/720.25 = 720.25/x
  3. Step 3: Cross multiply
    408.50x = 720.25 × 720.25
  4. Step 4: Simplify right side
    408.50x = 518,760.06
  5. Step 5: Solve for x
    x = 518,760.06/408.50
  6. Step 6: Final answer
    x = 1,269.91

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Why These Related Problems?

These problems maintain the same ratio (1.76) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.