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Finding the Fourth Proportional to 169.76, 255.04 and 121.92

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Solution

The fourth proportional to 169.76, 255.04 and 121.92 is: 183.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.76 : 255.04 = 121.92 : x
  2. Step 2: Convert to fraction form
    169.76/255.04 = 121.92/x
  3. Step 3: Cross multiply
    169.76x = 255.04 × 121.92
  4. Step 4: Simplify right side
    169.76x = 31,094.48
  5. Step 5: Solve for x
    x = 31,094.48/169.76
  6. Step 6: Final answer
    x = 183.17

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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.