Home / 3,880.78-5,355.20-2,112.36

Finding the Fourth Proportional to 3,880.78, 5,355.20 and 2,112.36

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Solution

The fourth proportional to 3,880.78, 5,355.20 and 2,112.36 is: 2,914.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,880.78 : 5,355.20 = 2,112.36 : x
  2. Step 2: Convert to fraction form
    3,880.78/5,355.20 = 2,112.36/x
  3. Step 3: Cross multiply
    3,880.78x = 5,355.20 × 2,112.36
  4. Step 4: Simplify right side
    3,880.78x = 11,312,110.27
  5. Step 5: Solve for x
    x = 11,312,110.27/3,880.78
  6. Step 6: Final answer
    x = 2,914.91

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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.