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Finding the Third Proportional to 68.81 and 161.63

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Solution

The third proportional to 68.81 and 161.63 is: 379.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.81 : 161.63 = 161.63 : x
  2. Step 2: Convert to fraction form
    68.81/161.63 = 161.63/x
  3. Step 3: Cross multiply
    68.81x = 161.63 × 161.63
  4. Step 4: Simplify right side
    68.81x = 26,122.64
  5. Step 5: Solve for x
    x = 26,122.64/68.81
  6. Step 6: Final answer
    x = 379.62

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Why These Related Problems?

These problems maintain the same ratio (2.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.