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Finding the Third Proportional to 321.25 and 405.94

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Solution

The third proportional to 321.25 and 405.94 is: 512.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.25 : 405.94 = 405.94 : x
  2. Step 2: Convert to fraction form
    321.25/405.94 = 405.94/x
  3. Step 3: Cross multiply
    321.25x = 405.94 × 405.94
  4. Step 4: Simplify right side
    321.25x = 164,785.25
  5. Step 5: Solve for x
    x = 164,785.25/321.25
  6. Step 6: Final answer
    x = 512.95

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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.