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Finding the Fourth Proportional to 3,861.62, 5,787.86 and 1,394.56

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Solution

The fourth proportional to 3,861.62, 5,787.86 and 1,394.56 is: 2,090.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,861.62 : 5,787.86 = 1,394.56 : x
  2. Step 2: Convert to fraction form
    3,861.62/5,787.86 = 1,394.56/x
  3. Step 3: Cross multiply
    3,861.62x = 5,787.86 × 1,394.56
  4. Step 4: Simplify right side
    3,861.62x = 8,071,507.06
  5. Step 5: Solve for x
    x = 8,071,507.06/3,861.62
  6. Step 6: Final answer
    x = 2,090.19

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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.