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Finding the Third Proportional to 74.91 and 161.16

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Solution

The third proportional to 74.91 and 161.16 is: 346.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.91 : 161.16 = 161.16 : x
  2. Step 2: Convert to fraction form
    74.91/161.16 = 161.16/x
  3. Step 3: Cross multiply
    74.91x = 161.16 × 161.16
  4. Step 4: Simplify right side
    74.91x = 25,971.34
  5. Step 5: Solve for x
    x = 25,971.34/74.91
  6. Step 6: Final answer
    x = 346.72

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.