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Finding the Fourth Proportional to 128.05, 192.38 and 119.54

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Solution

The fourth proportional to 128.05, 192.38 and 119.54 is: 179.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.05 : 192.38 = 119.54 : x
  2. Step 2: Convert to fraction form
    128.05/192.38 = 119.54/x
  3. Step 3: Cross multiply
    128.05x = 192.38 × 119.54
  4. Step 4: Simplify right side
    128.05x = 22,996.99
  5. Step 5: Solve for x
    x = 22,996.99/128.05
  6. Step 6: Final answer
    x = 179.60

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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.