Home / 3,121.60-4,309.92-2,788.96

Finding the Fourth Proportional to 3,121.60, 4,309.92 and 2,788.96

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Solution

The fourth proportional to 3,121.60, 4,309.92 and 2,788.96 is: 3,850.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.60 : 4,309.92 = 2,788.96 : x
  2. Step 2: Convert to fraction form
    3,121.60/4,309.92 = 2,788.96/x
  3. Step 3: Cross multiply
    3,121.60x = 4,309.92 × 2,788.96
  4. Step 4: Simplify right side
    3,121.60x = 12,020,194.48
  5. Step 5: Solve for x
    x = 12,020,194.48/3,121.60
  6. Step 6: Final answer
    x = 3,850.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.