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Finding the Third Proportional to 321.44 and 406.25

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Solution

The third proportional to 321.44 and 406.25 is: 513.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.44 : 406.25 = 406.25 : x
  2. Step 2: Convert to fraction form
    321.44/406.25 = 406.25/x
  3. Step 3: Cross multiply
    321.44x = 406.25 × 406.25
  4. Step 4: Simplify right side
    321.44x = 165,039.06
  5. Step 5: Solve for x
    x = 165,039.06/321.44
  6. Step 6: Final answer
    x = 513.44

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Why These Related Problems?

These problems maintain the same ratio (1.26) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.