Home / 3,854.20-5,781.30-1,257.40

Finding the Fourth Proportional to 3,854.20, 5,781.30 and 1,257.40

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Solution

The fourth proportional to 3,854.20, 5,781.30 and 1,257.40 is: 1,886.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,854.20 : 5,781.30 = 1,257.40 : x
  2. Step 2: Convert to fraction form
    3,854.20/5,781.30 = 1,257.40/x
  3. Step 3: Cross multiply
    3,854.20x = 5,781.30 × 1,257.40
  4. Step 4: Simplify right side
    3,854.20x = 7,269,406.62
  5. Step 5: Solve for x
    x = 7,269,406.62/3,854.20
  6. Step 6: Final answer
    x = 1,886.10

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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.