Home / 3,856.90-5,785.35-1,391.80

Finding the Fourth Proportional to 3,856.90, 5,785.35 and 1,391.80

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Solution

The fourth proportional to 3,856.90, 5,785.35 and 1,391.80 is: 2,087.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,856.90 : 5,785.35 = 1,391.80 : x
  2. Step 2: Convert to fraction form
    3,856.90/5,785.35 = 1,391.80/x
  3. Step 3: Cross multiply
    3,856.90x = 5,785.35 × 1,391.80
  4. Step 4: Simplify right side
    3,856.90x = 8,052,050.13
  5. Step 5: Solve for x
    x = 8,052,050.13/3,856.90
  6. Step 6: Final answer
    x = 2,087.70

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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.