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Finding the Fourth Proportional to 1,286.82, 1,929.56 and 636.75

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Solution

The fourth proportional to 1,286.82, 1,929.56 and 636.75 is: 954.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.82 : 1,929.56 = 636.75 : x
  2. Step 2: Convert to fraction form
    1,286.82/1,929.56 = 636.75/x
  3. Step 3: Cross multiply
    1,286.82x = 1,929.56 × 636.75
  4. Step 4: Simplify right side
    1,286.82x = 1,228,644.15
  5. Step 5: Solve for x
    x = 1,228,644.15/1,286.82
  6. Step 6: Final answer
    x = 954.79

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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.