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Finding the Fourth Proportional to 161.16, 221.92 and 108.69

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Solution

The fourth proportional to 161.16, 221.92 and 108.69 is: 149.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.16 : 221.92 = 108.69 : x
  2. Step 2: Convert to fraction form
    161.16/221.92 = 108.69/x
  3. Step 3: Cross multiply
    161.16x = 221.92 × 108.69
  4. Step 4: Simplify right side
    161.16x = 24,119.38
  5. Step 5: Solve for x
    x = 24,119.38/161.16
  6. Step 6: Final answer
    x = 149.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.