Home / 3,897.27-5,378.25-2,128.88

Finding the Fourth Proportional to 3,897.27, 5,378.25 and 2,128.88

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Solution

The fourth proportional to 3,897.27, 5,378.25 and 2,128.88 is: 2,937.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.27 : 5,378.25 = 2,128.88 : x
  2. Step 2: Convert to fraction form
    3,897.27/5,378.25 = 2,128.88/x
  3. Step 3: Cross multiply
    3,897.27x = 5,378.25 × 2,128.88
  4. Step 4: Simplify right side
    3,897.27x = 11,449,621.97
  5. Step 5: Solve for x
    x = 11,449,621.97/3,897.27
  6. Step 6: Final answer
    x = 2,937.86

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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.