Home / 2,857.60-4,286.40-2,638.90

Finding the Fourth Proportional to 2,857.60, 4,286.40 and 2,638.90

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Solution

The fourth proportional to 2,857.60, 4,286.40 and 2,638.90 is: 3,958.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,857.60 : 4,286.40 = 2,638.90 : x
  2. Step 2: Convert to fraction form
    2,857.60/4,286.40 = 2,638.90/x
  3. Step 3: Cross multiply
    2,857.60x = 4,286.40 × 2,638.90
  4. Step 4: Simplify right side
    2,857.60x = 11,311,380.96
  5. Step 5: Solve for x
    x = 11,311,380.96/2,857.60
  6. Step 6: Final answer
    x = 3,958.35

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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.