Home / 3,917.40-5,405.97-2,149

Finding the Fourth Proportional to 3,917.40, 5,405.97 and 2,149

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Solution

The fourth proportional to 3,917.40, 5,405.97 and 2,149 is: 2,965.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,917.40 : 5,405.97 = 2,149 : x
  2. Step 2: Convert to fraction form
    3,917.40/5,405.97 = 2,149/x
  3. Step 3: Cross multiply
    3,917.40x = 5,405.97 × 2,149
  4. Step 4: Simplify right side
    3,917.40x = 11,617,429.53
  5. Step 5: Solve for x
    x = 11,617,429.53/3,917.40
  6. Step 6: Final answer
    x = 2,965.60

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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.