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Finding the Fourth Proportional to 855.05, 1,282.57 and 205.79

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Solution

The fourth proportional to 855.05, 1,282.57 and 205.79 is: 308.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.05 : 1,282.57 = 205.79 : x
  2. Step 2: Convert to fraction form
    855.05/1,282.57 = 205.79/x
  3. Step 3: Cross multiply
    855.05x = 1,282.57 × 205.79
  4. Step 4: Simplify right side
    855.05x = 263,933.15
  5. Step 5: Solve for x
    x = 263,933.15/855.05
  6. Step 6: Final answer
    x = 308.68

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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.