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Finding the Third Proportional to 77.81 and 166.50

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Solution

The third proportional to 77.81 and 166.50 is: 356.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.81 : 166.50 = 166.50 : x
  2. Step 2: Convert to fraction form
    77.81/166.50 = 166.50/x
  3. Step 3: Cross multiply
    77.81x = 166.50 × 166.50
  4. Step 4: Simplify right side
    77.81x = 27,722.25
  5. Step 5: Solve for x
    x = 27,722.25/77.81
  6. Step 6: Final answer
    x = 356.27

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.