Home / 3,898.20-5,379.48-2,129.77

Finding the Fourth Proportional to 3,898.20, 5,379.48 and 2,129.77

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Solution

The fourth proportional to 3,898.20, 5,379.48 and 2,129.77 is: 2,939.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,898.20 : 5,379.48 = 2,129.77 : x
  2. Step 2: Convert to fraction form
    3,898.20/5,379.48 = 2,129.77/x
  3. Step 3: Cross multiply
    3,898.20x = 5,379.48 × 2,129.77
  4. Step 4: Simplify right side
    3,898.20x = 11,457,055.12
  5. Step 5: Solve for x
    x = 11,457,055.12/3,898.20
  6. Step 6: Final answer
    x = 2,939.06

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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.