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Finding the Third Proportional to 211.31 and 427.69

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Solution

The third proportional to 211.31 and 427.69 is: 865.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.31 : 427.69 = 427.69 : x
  2. Step 2: Convert to fraction form
    211.31/427.69 = 427.69/x
  3. Step 3: Cross multiply
    211.31x = 427.69 × 427.69
  4. Step 4: Simplify right side
    211.31x = 182,916.60
  5. Step 5: Solve for x
    x = 182,916.60/211.31
  6. Step 6: Final answer
    x = 865.62

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Why These Related Problems?

These problems maintain the same ratio (2.02) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.