Home / 3,880.60-5,355.20-2,112.20

Finding the Fourth Proportional to 3,880.60, 5,355.20 and 2,112.20

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Solution

The fourth proportional to 3,880.60, 5,355.20 and 2,112.20 is: 2,914.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,880.60 : 5,355.20 = 2,112.20 : x
  2. Step 2: Convert to fraction form
    3,880.60/5,355.20 = 2,112.20/x
  3. Step 3: Cross multiply
    3,880.60x = 5,355.20 × 2,112.20
  4. Step 4: Simplify right side
    3,880.60x = 11,311,253.44
  5. Step 5: Solve for x
    x = 11,311,253.44/3,880.60
  6. Step 6: Final answer
    x = 2,914.82

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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.