Home / 3,861.60-5,784.30-2,128.20

Finding the Fourth Proportional to 3,861.60, 5,784.30 and 2,128.20

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Solution

The fourth proportional to 3,861.60, 5,784.30 and 2,128.20 is: 3,187.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,861.60 : 5,784.30 = 2,128.20 : x
  2. Step 2: Convert to fraction form
    3,861.60/5,784.30 = 2,128.20/x
  3. Step 3: Cross multiply
    3,861.60x = 5,784.30 × 2,128.20
  4. Step 4: Simplify right side
    3,861.60x = 12,310,147.26
  5. Step 5: Solve for x
    x = 12,310,147.26/3,861.60
  6. Step 6: Final answer
    x = 3,187.84

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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.