Home / 3,128.76-4,694.36-1,280.75

Finding the Fourth Proportional to 3,128.76, 4,694.36 and 1,280.75

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Solution

The fourth proportional to 3,128.76, 4,694.36 and 1,280.75 is: 1,921.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128.76 : 4,694.36 = 1,280.75 : x
  2. Step 2: Convert to fraction form
    3,128.76/4,694.36 = 1,280.75/x
  3. Step 3: Cross multiply
    3,128.76x = 4,694.36 × 1,280.75
  4. Step 4: Simplify right side
    3,128.76x = 6,012,271.69
  5. Step 5: Solve for x
    x = 6,012,271.69/3,128.76
  6. Step 6: Final answer
    x = 1,921.61

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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.