Home / 3,897.26-5,378.22-2,128.90

Finding the Fourth Proportional to 3,897.26, 5,378.22 and 2,128.90

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Solution

The fourth proportional to 3,897.26, 5,378.22 and 2,128.90 is: 2,937.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.26 : 5,378.22 = 2,128.90 : x
  2. Step 2: Convert to fraction form
    3,897.26/5,378.22 = 2,128.90/x
  3. Step 3: Cross multiply
    3,897.26x = 5,378.22 × 2,128.90
  4. Step 4: Simplify right side
    3,897.26x = 11,449,692.56
  5. Step 5: Solve for x
    x = 11,449,692.56/3,897.26
  6. Step 6: Final answer
    x = 2,937.88

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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.