Home / 3,898.15-5,379.47-2,129.80

Finding the Fourth Proportional to 3,898.15, 5,379.47 and 2,129.80

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Solution

The fourth proportional to 3,898.15, 5,379.47 and 2,129.80 is: 2,939.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,898.15 : 5,379.47 = 2,129.80 : x
  2. Step 2: Convert to fraction form
    3,898.15/5,379.47 = 2,129.80/x
  3. Step 3: Cross multiply
    3,898.15x = 5,379.47 × 2,129.80
  4. Step 4: Simplify right side
    3,898.15x = 11,457,195.21
  5. Step 5: Solve for x
    x = 11,457,195.21/3,898.15
  6. Step 6: Final answer
    x = 2,939.14

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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.