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Finding the Fourth Proportional to 129.36, 178.22 and 118.86

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Solution

The fourth proportional to 129.36, 178.22 and 118.86 is: 163.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.36 : 178.22 = 118.86 : x
  2. Step 2: Convert to fraction form
    129.36/178.22 = 118.86/x
  3. Step 3: Cross multiply
    129.36x = 178.22 × 118.86
  4. Step 4: Simplify right side
    129.36x = 21,183.23
  5. Step 5: Solve for x
    x = 21,183.23/129.36
  6. Step 6: Final answer
    x = 163.75

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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.