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Finding the Third Proportional to 211.75 and 343.50

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Solution

The third proportional to 211.75 and 343.50 is: 557.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.75 : 343.50 = 343.50 : x
  2. Step 2: Convert to fraction form
    211.75/343.50 = 343.50/x
  3. Step 3: Cross multiply
    211.75x = 343.50 × 343.50
  4. Step 4: Simplify right side
    211.75x = 117,992.25
  5. Step 5: Solve for x
    x = 117,992.25/211.75
  6. Step 6: Final answer
    x = 557.22

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Why These Related Problems?

These problems maintain the same ratio (1.62) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.