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Finding the Fourth Proportional to 169.92, 255 and 121.68

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Solution

The fourth proportional to 169.92, 255 and 121.68 is: 182.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.92 : 255 = 121.68 : x
  2. Step 2: Convert to fraction form
    169.92/255 = 121.68/x
  3. Step 3: Cross multiply
    169.92x = 255 × 121.68
  4. Step 4: Simplify right side
    169.92x = 31,028.40
  5. Step 5: Solve for x
    x = 31,028.40/169.92
  6. Step 6: Final answer
    x = 182.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.