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Finding the Fourth Proportional to 129.12, 194.52 and 118.80

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Solution

The fourth proportional to 129.12, 194.52 and 118.80 is: 178.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.12 : 194.52 = 118.80 : x
  2. Step 2: Convert to fraction form
    129.12/194.52 = 118.80/x
  3. Step 3: Cross multiply
    129.12x = 194.52 × 118.80
  4. Step 4: Simplify right side
    129.12x = 23,108.98
  5. Step 5: Solve for x
    x = 23,108.98/129.12
  6. Step 6: Final answer
    x = 178.97

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.