Home / 3,897.29-5,378.16-2,128.85

Finding the Fourth Proportional to 3,897.29, 5,378.16 and 2,128.85

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Solution

The fourth proportional to 3,897.29, 5,378.16 and 2,128.85 is: 2,937.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.29 : 5,378.16 = 2,128.85 : x
  2. Step 2: Convert to fraction form
    3,897.29/5,378.16 = 2,128.85/x
  3. Step 3: Cross multiply
    3,897.29x = 5,378.16 × 2,128.85
  4. Step 4: Simplify right side
    3,897.29x = 11,449,295.92
  5. Step 5: Solve for x
    x = 11,449,295.92/3,897.29
  6. Step 6: Final answer
    x = 2,937.76

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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.