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Finding the Fourth Proportional to 3,861.28, 5,787.12 and 1,778.32

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Solution

The fourth proportional to 3,861.28, 5,787.12 and 1,778.32 is: 2,665.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,861.28 : 5,787.12 = 1,778.32 : x
  2. Step 2: Convert to fraction form
    3,861.28/5,787.12 = 1,778.32/x
  3. Step 3: Cross multiply
    3,861.28x = 5,787.12 × 1,778.32
  4. Step 4: Simplify right side
    3,861.28x = 10,291,351.24
  5. Step 5: Solve for x
    x = 10,291,351.24/3,861.28
  6. Step 6: Final answer
    x = 2,665.27

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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.