Home / 2,811.20-4,209.60-2,076.80

Finding the Fourth Proportional to 2,811.20, 4,209.60 and 2,076.80

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Solution

The fourth proportional to 2,811.20, 4,209.60 and 2,076.80 is: 3,109.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.20 : 4,209.60 = 2,076.80 : x
  2. Step 2: Convert to fraction form
    2,811.20/4,209.60 = 2,076.80/x
  3. Step 3: Cross multiply
    2,811.20x = 4,209.60 × 2,076.80
  4. Step 4: Simplify right side
    2,811.20x = 8,742,497.28
  5. Step 5: Solve for x
    x = 8,742,497.28/2,811.20
  6. Step 6: Final answer
    x = 3,109.88

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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.