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Finding the Fourth Proportional to 118.36, 163.20 and 115.12

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Solution

The fourth proportional to 118.36, 163.20 and 115.12 is: 158.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.36 : 163.20 = 115.12 : x
  2. Step 2: Convert to fraction form
    118.36/163.20 = 115.12/x
  3. Step 3: Cross multiply
    118.36x = 163.20 × 115.12
  4. Step 4: Simplify right side
    118.36x = 18,787.58
  5. Step 5: Solve for x
    x = 18,787.58/118.36
  6. Step 6: Final answer
    x = 158.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.