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Finding the Fourth Proportional to 1,286.33, 1,928.42 and 874.31

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Solution

The fourth proportional to 1,286.33, 1,928.42 and 874.31 is: 1,310.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.33 : 1,928.42 = 874.31 : x
  2. Step 2: Convert to fraction form
    1,286.33/1,928.42 = 874.31/x
  3. Step 3: Cross multiply
    1,286.33x = 1,928.42 × 874.31
  4. Step 4: Simplify right side
    1,286.33x = 1,686,032.52
  5. Step 5: Solve for x
    x = 1,686,032.52/1,286.33
  6. Step 6: Final answer
    x = 1,310.73

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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.