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Finding the Fourth Proportional to 195.65, 270.11 and 129.36

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Solution

The fourth proportional to 195.65, 270.11 and 129.36 is: 178.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    195.65 : 270.11 = 129.36 : x
  2. Step 2: Convert to fraction form
    195.65/270.11 = 129.36/x
  3. Step 3: Cross multiply
    195.65x = 270.11 × 129.36
  4. Step 4: Simplify right side
    195.65x = 34,940.78
  5. Step 5: Solve for x
    x = 34,940.78/195.65
  6. Step 6: Final answer
    x = 178.59

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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.