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Finding the Fourth Proportional to 128.11, 176.06 and 115.54

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Solution

The fourth proportional to 128.11, 176.06 and 115.54 is: 158.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.11 : 176.06 = 115.54 : x
  2. Step 2: Convert to fraction form
    128.11/176.06 = 115.54/x
  3. Step 3: Cross multiply
    128.11x = 176.06 × 115.54
  4. Step 4: Simplify right side
    128.11x = 20,341.97
  5. Step 5: Solve for x
    x = 20,341.97/128.11
  6. Step 6: Final answer
    x = 158.79

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.