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Finding the Fourth Proportional to 195.30, 269.48 and 121.55

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Solution

The fourth proportional to 195.30, 269.48 and 121.55 is: 167.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    195.30 : 269.48 = 121.55 : x
  2. Step 2: Convert to fraction form
    195.30/269.48 = 121.55/x
  3. Step 3: Cross multiply
    195.30x = 269.48 × 121.55
  4. Step 4: Simplify right side
    195.30x = 32,753.34
  5. Step 5: Solve for x
    x = 32,753.34/195.30
  6. Step 6: Final answer
    x = 167.71

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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.