Home / 3,920.28-5,405.10-3,078.42

Finding the Fourth Proportional to 3,920.28, 5,405.10 and 3,078.42

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Solution

The fourth proportional to 3,920.28, 5,405.10 and 3,078.42 is: 4,244.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,920.28 : 5,405.10 = 3,078.42 : x
  2. Step 2: Convert to fraction form
    3,920.28/5,405.10 = 3,078.42/x
  3. Step 3: Cross multiply
    3,920.28x = 5,405.10 × 3,078.42
  4. Step 4: Simplify right side
    3,920.28x = 16,639,167.94
  5. Step 5: Solve for x
    x = 16,639,167.94/3,920.28
  6. Step 6: Final answer
    x = 4,244.38

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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.