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Finding the Fourth Proportional to 3,861.17, 5,787.11 and 1,778.31

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Solution

The fourth proportional to 3,861.17, 5,787.11 and 1,778.31 is: 2,665.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,861.17 : 5,787.11 = 1,778.31 : x
  2. Step 2: Convert to fraction form
    3,861.17/5,787.11 = 1,778.31/x
  3. Step 3: Cross multiply
    3,861.17x = 5,787.11 × 1,778.31
  4. Step 4: Simplify right side
    3,861.17x = 10,291,280.03
  5. Step 5: Solve for x
    x = 10,291,280.03/3,861.17
  6. Step 6: Final answer
    x = 2,665.33

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1.5x scale

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.