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Finding the Fourth Proportional to 128.20, 192.34 and 80.14

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Solution

The fourth proportional to 128.20, 192.34 and 80.14 is: 120.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.20 : 192.34 = 80.14 : x
  2. Step 2: Convert to fraction form
    128.20/192.34 = 80.14/x
  3. Step 3: Cross multiply
    128.20x = 192.34 × 80.14
  4. Step 4: Simplify right side
    128.20x = 15,414.13
  5. Step 5: Solve for x
    x = 15,414.13/128.20
  6. Step 6: Final answer
    x = 120.24

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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.