Home / 3,939.20-5,436.12-2,170.77

Finding the Fourth Proportional to 3,939.20, 5,436.12 and 2,170.77

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Solution

The fourth proportional to 3,939.20, 5,436.12 and 2,170.77 is: 2,995.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,939.20 : 5,436.12 = 2,170.77 : x
  2. Step 2: Convert to fraction form
    3,939.20/5,436.12 = 2,170.77/x
  3. Step 3: Cross multiply
    3,939.20x = 5,436.12 × 2,170.77
  4. Step 4: Simplify right side
    3,939.20x = 11,800,566.21
  5. Step 5: Solve for x
    x = 11,800,566.21/3,939.20
  6. Step 6: Final answer
    x = 2,995.68

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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.