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Finding the Third Proportional to 102.09 and 211.78

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Solution

The third proportional to 102.09 and 211.78 is: 439.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.09 : 211.78 = 211.78 : x
  2. Step 2: Convert to fraction form
    102.09/211.78 = 211.78/x
  3. Step 3: Cross multiply
    102.09x = 211.78 × 211.78
  4. Step 4: Simplify right side
    102.09x = 44,851.30
  5. Step 5: Solve for x
    x = 44,851.30/102.09
  6. Step 6: Final answer
    x = 439.31

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Why These Related Problems?

These problems maintain the same ratio (2.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.