Home / 3,897.30-5,378.22-2,128.87

Finding the Fourth Proportional to 3,897.30, 5,378.22 and 2,128.87

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Solution

The fourth proportional to 3,897.30, 5,378.22 and 2,128.87 is: 2,937.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.30 : 5,378.22 = 2,128.87 : x
  2. Step 2: Convert to fraction form
    3,897.30/5,378.22 = 2,128.87/x
  3. Step 3: Cross multiply
    3,897.30x = 5,378.22 × 2,128.87
  4. Step 4: Simplify right side
    3,897.30x = 11,449,531.21
  5. Step 5: Solve for x
    x = 11,449,531.21/3,897.30
  6. Step 6: Final answer
    x = 2,937.81

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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.