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Finding the Fourth Proportional to 3,809.28, 5,713.92 and 1,986.56

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Solution

The fourth proportional to 3,809.28, 5,713.92 and 1,986.56 is: 2,979.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,809.28 : 5,713.92 = 1,986.56 : x
  2. Step 2: Convert to fraction form
    3,809.28/5,713.92 = 1,986.56/x
  3. Step 3: Cross multiply
    3,809.28x = 5,713.92 × 1,986.56
  4. Step 4: Simplify right side
    3,809.28x = 11,351,044.92
  5. Step 5: Solve for x
    x = 11,351,044.92/3,809.28
  6. Step 6: Final answer
    x = 2,979.84

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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.