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Finding the Third Proportional to 309.50 and 343.50

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Solution

The third proportional to 309.50 and 343.50 is: 381.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.50 : 343.50 = 343.50 : x
  2. Step 2: Convert to fraction form
    309.50/343.50 = 343.50/x
  3. Step 3: Cross multiply
    309.50x = 343.50 × 343.50
  4. Step 4: Simplify right side
    309.50x = 117,992.25
  5. Step 5: Solve for x
    x = 117,992.25/309.50
  6. Step 6: Final answer
    x = 381.24

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.