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Finding the Fourth Proportional to 205.11, 307.56 and 112.56

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Solution

The fourth proportional to 205.11, 307.56 and 112.56 is: 168.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.11 : 307.56 = 112.56 : x
  2. Step 2: Convert to fraction form
    205.11/307.56 = 112.56/x
  3. Step 3: Cross multiply
    205.11x = 307.56 × 112.56
  4. Step 4: Simplify right side
    205.11x = 34,618.95
  5. Step 5: Solve for x
    x = 34,618.95/205.11
  6. Step 6: Final answer
    x = 168.78

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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.