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Finding the Fourth Proportional to 161.28, 222.77 and 121.89

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Solution

The fourth proportional to 161.28, 222.77 and 121.89 is: 168.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.28 : 222.77 = 121.89 : x
  2. Step 2: Convert to fraction form
    161.28/222.77 = 121.89/x
  3. Step 3: Cross multiply
    161.28x = 222.77 × 121.89
  4. Step 4: Simplify right side
    161.28x = 27,152.83
  5. Step 5: Solve for x
    x = 27,152.83/161.28
  6. Step 6: Final answer
    x = 168.36

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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.