Home / 3,898.12-5,379.36-2,129.76

Finding the Fourth Proportional to 3,898.12, 5,379.36 and 2,129.76

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Solution

The fourth proportional to 3,898.12, 5,379.36 and 2,129.76 is: 2,939.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,898.12 : 5,379.36 = 2,129.76 : x
  2. Step 2: Convert to fraction form
    3,898.12/5,379.36 = 2,129.76/x
  3. Step 3: Cross multiply
    3,898.12x = 5,379.36 × 2,129.76
  4. Step 4: Simplify right side
    3,898.12x = 11,456,745.75
  5. Step 5: Solve for x
    x = 11,456,745.75/3,898.12
  6. Step 6: Final answer
    x = 2,939.04

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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.