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Finding the Third Proportional to 166.31 and 251.81

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Solution

The third proportional to 166.31 and 251.81 is: 381.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.31 : 251.81 = 251.81 : x
  2. Step 2: Convert to fraction form
    166.31/251.81 = 251.81/x
  3. Step 3: Cross multiply
    166.31x = 251.81 × 251.81
  4. Step 4: Simplify right side
    166.31x = 63,409.54
  5. Step 5: Solve for x
    x = 63,409.54/166.31
  6. Step 6: Final answer
    x = 381.27

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.