Home / 3,936.60-5,431.46-3,139.56

Finding the Fourth Proportional to 3,936.60, 5,431.46 and 3,139.56

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Solution

The fourth proportional to 3,936.60, 5,431.46 and 3,139.56 is: 4,331.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,936.60 : 5,431.46 = 3,139.56 : x
  2. Step 2: Convert to fraction form
    3,936.60/5,431.46 = 3,139.56/x
  3. Step 3: Cross multiply
    3,936.60x = 5,431.46 × 3,139.56
  4. Step 4: Simplify right side
    3,936.60x = 17,052,378.86
  5. Step 5: Solve for x
    x = 17,052,378.86/3,936.60
  6. Step 6: Final answer
    x = 4,331.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.