Home / 2,620.80-3,928.28-1,138.32

Finding the Fourth Proportional to 2,620.80, 3,928.28 and 1,138.32

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Solution

The fourth proportional to 2,620.80, 3,928.28 and 1,138.32 is: 1,706.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,620.80 : 3,928.28 = 1,138.32 : x
  2. Step 2: Convert to fraction form
    2,620.80/3,928.28 = 1,138.32/x
  3. Step 3: Cross multiply
    2,620.80x = 3,928.28 × 1,138.32
  4. Step 4: Simplify right side
    2,620.80x = 4,471,639.69
  5. Step 5: Solve for x
    x = 4,471,639.69/2,620.80
  6. Step 6: Final answer
    x = 1,706.21

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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.