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Finding the Third Proportional to 381.50 and 812.38

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Solution

The third proportional to 381.50 and 812.38 is: 1,729.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.50 : 812.38 = 812.38 : x
  2. Step 2: Convert to fraction form
    381.50/812.38 = 812.38/x
  3. Step 3: Cross multiply
    381.50x = 812.38 × 812.38
  4. Step 4: Simplify right side
    381.50x = 659,953.14
  5. Step 5: Solve for x
    x = 659,953.14/381.50
  6. Step 6: Final answer
    x = 1,729.89

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.