Home / 3,907.20-5,391.90-2,138.79

Finding the Fourth Proportional to 3,907.20, 5,391.90 and 2,138.79

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Solution

The fourth proportional to 3,907.20, 5,391.90 and 2,138.79 is: 2,951.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,907.20 : 5,391.90 = 2,138.79 : x
  2. Step 2: Convert to fraction form
    3,907.20/5,391.90 = 2,138.79/x
  3. Step 3: Cross multiply
    3,907.20x = 5,391.90 × 2,138.79
  4. Step 4: Simplify right side
    3,907.20x = 11,532,141.80
  5. Step 5: Solve for x
    x = 11,532,141.80/3,907.20
  6. Step 6: Final answer
    x = 2,951.51

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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.