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Finding the Third Proportional to 357.50 and 391.25

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Solution

The third proportional to 357.50 and 391.25 is: 428.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.50 : 391.25 = 391.25 : x
  2. Step 2: Convert to fraction form
    357.50/391.25 = 391.25/x
  3. Step 3: Cross multiply
    357.50x = 391.25 × 391.25
  4. Step 4: Simplify right side
    357.50x = 153,076.56
  5. Step 5: Solve for x
    x = 153,076.56/357.50
  6. Step 6: Final answer
    x = 428.19

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.