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Finding the Third Proportional to 409 and 721.25

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Solution

The third proportional to 409 and 721.25 is: 1,271.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    409 : 721.25 = 721.25 : x
  2. Step 2: Convert to fraction form
    409/721.25 = 721.25/x
  3. Step 3: Cross multiply
    409x = 721.25 × 721.25
  4. Step 4: Simplify right side
    409x = 520,201.56
  5. Step 5: Solve for x
    x = 520,201.56/409
  6. Step 6: Final answer
    x = 1,271.89

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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.