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Finding the Fourth Proportional to 128.11, 192.19 and 55.97

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Solution

The fourth proportional to 128.11, 192.19 and 55.97 is: 83.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.11 : 192.19 = 55.97 : x
  2. Step 2: Convert to fraction form
    128.11/192.19 = 55.97/x
  3. Step 3: Cross multiply
    128.11x = 192.19 × 55.97
  4. Step 4: Simplify right side
    128.11x = 10,756.60
  5. Step 5: Solve for x
    x = 10,756.60/128.11
  6. Step 6: Final answer
    x = 83.96

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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.