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Finding the Fourth Proportional to 161.68, 221.19 and 161.22

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Solution

The fourth proportional to 161.68, 221.19 and 161.22 is: 220.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.68 : 221.19 = 161.22 : x
  2. Step 2: Convert to fraction form
    161.68/221.19 = 161.22/x
  3. Step 3: Cross multiply
    161.68x = 221.19 × 161.22
  4. Step 4: Simplify right side
    161.68x = 35,659.45
  5. Step 5: Solve for x
    x = 35,659.45/161.68
  6. Step 6: Final answer
    x = 220.56

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.