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Finding the Third Proportional to 166.50 and 218.81

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Solution

The third proportional to 166.50 and 218.81 is: 287.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.50 : 218.81 = 218.81 : x
  2. Step 2: Convert to fraction form
    166.50/218.81 = 218.81/x
  3. Step 3: Cross multiply
    166.50x = 218.81 × 218.81
  4. Step 4: Simplify right side
    166.50x = 47,878.91
  5. Step 5: Solve for x
    x = 47,878.91/166.50
  6. Step 6: Final answer
    x = 287.56

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.