Home / 3,854.70-5,778.57-1,387.78

Finding the Fourth Proportional to 3,854.70, 5,778.57 and 1,387.78

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Solution

The fourth proportional to 3,854.70, 5,778.57 and 1,387.78 is: 2,080.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,854.70 : 5,778.57 = 1,387.78 : x
  2. Step 2: Convert to fraction form
    3,854.70/5,778.57 = 1,387.78/x
  3. Step 3: Cross multiply
    3,854.70x = 5,778.57 × 1,387.78
  4. Step 4: Simplify right side
    3,854.70x = 8,019,396.30
  5. Step 5: Solve for x
    x = 8,019,396.30/3,854.70
  6. Step 6: Final answer
    x = 2,080.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.