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Finding the Fourth Proportional to 258.80, 388.19 and 121.97

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Solution

The fourth proportional to 258.80, 388.19 and 121.97 is: 182.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.80 : 388.19 = 121.97 : x
  2. Step 2: Convert to fraction form
    258.80/388.19 = 121.97/x
  3. Step 3: Cross multiply
    258.80x = 388.19 × 121.97
  4. Step 4: Simplify right side
    258.80x = 47,344.98
  5. Step 5: Solve for x
    x = 47,344.98/258.80
  6. Step 6: Final answer
    x = 182.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.