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Finding the Fourth Proportional to 128.27, 192.02 and 84.85

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Solution

The fourth proportional to 128.27, 192.02 and 84.85 is: 127.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.27 : 192.02 = 84.85 : x
  2. Step 2: Convert to fraction form
    128.27/192.02 = 84.85/x
  3. Step 3: Cross multiply
    128.27x = 192.02 × 84.85
  4. Step 4: Simplify right side
    128.27x = 16,292.90
  5. Step 5: Solve for x
    x = 16,292.90/128.27
  6. Step 6: Final answer
    x = 127.03

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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.