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Finding the Fourth Proportional to 205.58, 283.68 and 121.59

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Solution

The fourth proportional to 205.58, 283.68 and 121.59 is: 167.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.58 : 283.68 = 121.59 : x
  2. Step 2: Convert to fraction form
    205.58/283.68 = 121.59/x
  3. Step 3: Cross multiply
    205.58x = 283.68 × 121.59
  4. Step 4: Simplify right side
    205.58x = 34,492.65
  5. Step 5: Solve for x
    x = 34,492.65/205.58
  6. Step 6: Final answer
    x = 167.78

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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.