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Finding the Fourth Proportional to 3,856.80, 5,781.80 and 1,391.04

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Solution

The fourth proportional to 3,856.80, 5,781.80 and 1,391.04 is: 2,085.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,856.80 : 5,781.80 = 1,391.04 : x
  2. Step 2: Convert to fraction form
    3,856.80/5,781.80 = 1,391.04/x
  3. Step 3: Cross multiply
    3,856.80x = 5,781.80 × 1,391.04
  4. Step 4: Simplify right side
    3,856.80x = 8,042,715.07
  5. Step 5: Solve for x
    x = 8,042,715.07/3,856.80
  6. Step 6: Final answer
    x = 2,085.33

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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.