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Finding the Fourth Proportional to 195.60, 269.86 and 121.79

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Solution

The fourth proportional to 195.60, 269.86 and 121.79 is: 168.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    195.60 : 269.86 = 121.79 : x
  2. Step 2: Convert to fraction form
    195.60/269.86 = 121.79/x
  3. Step 3: Cross multiply
    195.60x = 269.86 × 121.79
  4. Step 4: Simplify right side
    195.60x = 32,866.25
  5. Step 5: Solve for x
    x = 32,866.25/195.60
  6. Step 6: Final answer
    x = 168.03

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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.