Home / 3,899.20-5,380.86-2,130.78

Finding the Fourth Proportional to 3,899.20, 5,380.86 and 2,130.78

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Solution

The fourth proportional to 3,899.20, 5,380.86 and 2,130.78 is: 2,940.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,899.20 : 5,380.86 = 2,130.78 : x
  2. Step 2: Convert to fraction form
    3,899.20/5,380.86 = 2,130.78/x
  3. Step 3: Cross multiply
    3,899.20x = 5,380.86 × 2,130.78
  4. Step 4: Simplify right side
    3,899.20x = 11,465,428.87
  5. Step 5: Solve for x
    x = 11,465,428.87/3,899.20
  6. Step 6: Final answer
    x = 2,940.46

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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.