Home / 3,899.16-5,380.56-2,130.39

Finding the Fourth Proportional to 3,899.16, 5,380.56 and 2,130.39

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Solution

The fourth proportional to 3,899.16, 5,380.56 and 2,130.39 is: 2,939.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,899.16 : 5,380.56 = 2,130.39 : x
  2. Step 2: Convert to fraction form
    3,899.16/5,380.56 = 2,130.39/x
  3. Step 3: Cross multiply
    3,899.16x = 5,380.56 × 2,130.39
  4. Step 4: Simplify right side
    3,899.16x = 11,462,691.22
  5. Step 5: Solve for x
    x = 11,462,691.22/3,899.16
  6. Step 6: Final answer
    x = 2,939.78

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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.