Home / 3,899.40-5,380.86-2,131.02

Finding the Fourth Proportional to 3,899.40, 5,380.86 and 2,131.02

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Solution

The fourth proportional to 3,899.40, 5,380.86 and 2,131.02 is: 2,940.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,899.40 : 5,380.86 = 2,131.02 : x
  2. Step 2: Convert to fraction form
    3,899.40/5,380.86 = 2,131.02/x
  3. Step 3: Cross multiply
    3,899.40x = 5,380.86 × 2,131.02
  4. Step 4: Simplify right side
    3,899.40x = 11,466,720.28
  5. Step 5: Solve for x
    x = 11,466,720.28/3,899.40
  6. Step 6: Final answer
    x = 2,940.64

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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.