Home / 3,899.40-5,381.25-2,131.08

Finding the Fourth Proportional to 3,899.40, 5,381.25 and 2,131.08

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Solution

The fourth proportional to 3,899.40, 5,381.25 and 2,131.08 is: 2,940.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,899.40 : 5,381.25 = 2,131.08 : x
  2. Step 2: Convert to fraction form
    3,899.40/5,381.25 = 2,131.08/x
  3. Step 3: Cross multiply
    3,899.40x = 5,381.25 × 2,131.08
  4. Step 4: Simplify right side
    3,899.40x = 11,467,874.25
  5. Step 5: Solve for x
    x = 11,467,874.25/3,899.40
  6. Step 6: Final answer
    x = 2,940.93

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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.