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Finding the Fourth Proportional to 149.28, 222.96 and 121.92

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Solution

The fourth proportional to 149.28, 222.96 and 121.92 is: 182.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.28 : 222.96 = 121.92 : x
  2. Step 2: Convert to fraction form
    149.28/222.96 = 121.92/x
  3. Step 3: Cross multiply
    149.28x = 222.96 × 121.92
  4. Step 4: Simplify right side
    149.28x = 27,183.28
  5. Step 5: Solve for x
    x = 27,183.28/149.28
  6. Step 6: Final answer
    x = 182.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.