Home / 3,899.41-5,380.90-2,130.64

Finding the Fourth Proportional to 3,899.41, 5,380.90 and 2,130.64

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Solution

The fourth proportional to 3,899.41, 5,380.90 and 2,130.64 is: 2,940.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,899.41 : 5,380.90 = 2,130.64 : x
  2. Step 2: Convert to fraction form
    3,899.41/5,380.90 = 2,130.64/x
  3. Step 3: Cross multiply
    3,899.41x = 5,380.90 × 2,130.64
  4. Step 4: Simplify right side
    3,899.41x = 11,464,760.78
  5. Step 5: Solve for x
    x = 11,464,760.78/3,899.41
  6. Step 6: Final answer
    x = 2,940.13

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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.