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Finding the Fourth Proportional to 129.67, 195.28 and 118.15

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Solution

The fourth proportional to 129.67, 195.28 and 118.15 is: 177.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.67 : 195.28 = 118.15 : x
  2. Step 2: Convert to fraction form
    129.67/195.28 = 118.15/x
  3. Step 3: Cross multiply
    129.67x = 195.28 × 118.15
  4. Step 4: Simplify right side
    129.67x = 23,072.33
  5. Step 5: Solve for x
    x = 23,072.33/129.67
  6. Step 6: Final answer
    x = 177.93

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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.