Home / 3,928.40-5,420.68-2,355.92

Finding the Fourth Proportional to 3,928.40, 5,420.68 and 2,355.92

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Solution

The fourth proportional to 3,928.40, 5,420.68 and 2,355.92 is: 3,250.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928.40 : 5,420.68 = 2,355.92 : x
  2. Step 2: Convert to fraction form
    3,928.40/5,420.68 = 2,355.92/x
  3. Step 3: Cross multiply
    3,928.40x = 5,420.68 × 2,355.92
  4. Step 4: Simplify right side
    3,928.40x = 12,770,688.43
  5. Step 5: Solve for x
    x = 12,770,688.43/3,928.40
  6. Step 6: Final answer
    x = 3,250.86

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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.