Home / 3,906.75-5,391.45-2,138.36

Finding the Fourth Proportional to 3,906.75, 5,391.45 and 2,138.36

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Solution

The fourth proportional to 3,906.75, 5,391.45 and 2,138.36 is: 2,951.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,906.75 : 5,391.45 = 2,138.36 : x
  2. Step 2: Convert to fraction form
    3,906.75/5,391.45 = 2,138.36/x
  3. Step 3: Cross multiply
    3,906.75x = 5,391.45 × 2,138.36
  4. Step 4: Simplify right side
    3,906.75x = 11,528,834.06
  5. Step 5: Solve for x
    x = 11,528,834.06/3,906.75
  6. Step 6: Final answer
    x = 2,951.00

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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.