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Finding the Third Proportional to 211.50 and 415.13

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Solution

The third proportional to 211.50 and 415.13 is: 814.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.50 : 415.13 = 415.13 : x
  2. Step 2: Convert to fraction form
    211.50/415.13 = 415.13/x
  3. Step 3: Cross multiply
    211.50x = 415.13 × 415.13
  4. Step 4: Simplify right side
    211.50x = 172,328.77
  5. Step 5: Solve for x
    x = 172,328.77/211.50
  6. Step 6: Final answer
    x = 814.79

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Why These Related Problems?

These problems maintain the same ratio (1.96) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.