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Finding the Fourth Proportional to 1,286.09, 1,930.82 and 825.74

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Solution

The fourth proportional to 1,286.09, 1,930.82 and 825.74 is: 1,239.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.09 : 1,930.82 = 825.74 : x
  2. Step 2: Convert to fraction form
    1,286.09/1,930.82 = 825.74/x
  3. Step 3: Cross multiply
    1,286.09x = 1,930.82 × 825.74
  4. Step 4: Simplify right side
    1,286.09x = 1,594,341.52
  5. Step 5: Solve for x
    x = 1,594,341.52/1,286.09
  6. Step 6: Final answer
    x = 1,239.69

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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.