Home / 3,930.20-5,423.61-2,137.70

Finding the Fourth Proportional to 3,930.20, 5,423.61 and 2,137.70

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Solution

The fourth proportional to 3,930.20, 5,423.61 and 2,137.70 is: 2,949.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,930.20 : 5,423.61 = 2,137.70 : x
  2. Step 2: Convert to fraction form
    3,930.20/5,423.61 = 2,137.70/x
  3. Step 3: Cross multiply
    3,930.20x = 5,423.61 × 2,137.70
  4. Step 4: Simplify right side
    3,930.20x = 11,594,023.98
  5. Step 5: Solve for x
    x = 11,594,023.98/3,930.20
  6. Step 6: Final answer
    x = 2,949.99

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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.