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Finding the Third Proportional to 321.75 and 511.25

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Solution

The third proportional to 321.75 and 511.25 is: 812.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.75 : 511.25 = 511.25 : x
  2. Step 2: Convert to fraction form
    321.75/511.25 = 511.25/x
  3. Step 3: Cross multiply
    321.75x = 511.25 × 511.25
  4. Step 4: Simplify right side
    321.75x = 261,376.56
  5. Step 5: Solve for x
    x = 261,376.56/321.75
  6. Step 6: Final answer
    x = 812.36

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.