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Finding the Fourth Proportional to 205.80, 308.64 and 133.56

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Solution

The fourth proportional to 205.80, 308.64 and 133.56 is: 200.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.80 : 308.64 = 133.56 : x
  2. Step 2: Convert to fraction form
    205.80/308.64 = 133.56/x
  3. Step 3: Cross multiply
    205.80x = 308.64 × 133.56
  4. Step 4: Simplify right side
    205.80x = 41,221.96
  5. Step 5: Solve for x
    x = 41,221.96/205.80
  6. Step 6: Final answer
    x = 200.30

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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.