Home / 3,939.20-5,438.04-2,686.76

Finding the Fourth Proportional to 3,939.20, 5,438.04 and 2,686.76

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Solution

The fourth proportional to 3,939.20, 5,438.04 and 2,686.76 is: 3,709.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,939.20 : 5,438.04 = 2,686.76 : x
  2. Step 2: Convert to fraction form
    3,939.20/5,438.04 = 2,686.76/x
  3. Step 3: Cross multiply
    3,939.20x = 5,438.04 × 2,686.76
  4. Step 4: Simplify right side
    3,939.20x = 14,610,708.35
  5. Step 5: Solve for x
    x = 14,610,708.35/3,939.20
  6. Step 6: Final answer
    x = 3,709.05

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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.