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Finding the Fourth Proportional to 205.80, 283.91 and 121.79

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Solution

The fourth proportional to 205.80, 283.91 and 121.79 is: 168.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.80 : 283.91 = 121.79 : x
  2. Step 2: Convert to fraction form
    205.80/283.91 = 121.79/x
  3. Step 3: Cross multiply
    205.80x = 283.91 × 121.79
  4. Step 4: Simplify right side
    205.80x = 34,575.37
  5. Step 5: Solve for x
    x = 34,575.37/205.80
  6. Step 6: Final answer
    x = 168.00

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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.