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Finding the Fourth Proportional to 1,391.94, 2,087.79 and 843.96

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Solution

The fourth proportional to 1,391.94, 2,087.79 and 843.96 is: 1,265.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.94 : 2,087.79 = 843.96 : x
  2. Step 2: Convert to fraction form
    1,391.94/2,087.79 = 843.96/x
  3. Step 3: Cross multiply
    1,391.94x = 2,087.79 × 843.96
  4. Step 4: Simplify right side
    1,391.94x = 1,762,011.25
  5. Step 5: Solve for x
    x = 1,762,011.25/1,391.94
  6. Step 6: Final answer
    x = 1,265.87

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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.