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Finding the Fourth Proportional to 1,251.72, 1,878.39 and 839.97

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Solution

The fourth proportional to 1,251.72, 1,878.39 and 839.97 is: 1,260.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.72 : 1,878.39 = 839.97 : x
  2. Step 2: Convert to fraction form
    1,251.72/1,878.39 = 839.97/x
  3. Step 3: Cross multiply
    1,251.72x = 1,878.39 × 839.97
  4. Step 4: Simplify right side
    1,251.72x = 1,577,791.25
  5. Step 5: Solve for x
    x = 1,577,791.25/1,251.72
  6. Step 6: Final answer
    x = 1,260.50

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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.