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Finding the Fourth Proportional to 128.79, 192.78 and 110.97

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Solution

The fourth proportional to 128.79, 192.78 and 110.97 is: 166.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.79 : 192.78 = 110.97 : x
  2. Step 2: Convert to fraction form
    128.79/192.78 = 110.97/x
  3. Step 3: Cross multiply
    128.79x = 192.78 × 110.97
  4. Step 4: Simplify right side
    128.79x = 21,392.80
  5. Step 5: Solve for x
    x = 21,392.80/128.79
  6. Step 6: Final answer
    x = 166.11

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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.