Home / 3,939.78-5,429.41-2,818.77

Finding the Fourth Proportional to 3,939.78, 5,429.41 and 2,818.77

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Solution

The fourth proportional to 3,939.78, 5,429.41 and 2,818.77 is: 3,884.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,939.78 : 5,429.41 = 2,818.77 : x
  2. Step 2: Convert to fraction form
    3,939.78/5,429.41 = 2,818.77/x
  3. Step 3: Cross multiply
    3,939.78x = 5,429.41 × 2,818.77
  4. Step 4: Simplify right side
    3,939.78x = 15,304,240.67
  5. Step 5: Solve for x
    x = 15,304,240.67/3,939.78
  6. Step 6: Final answer
    x = 3,884.55

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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.