Home / 2,120.80-3,181.20-1,942.60

Finding the Fourth Proportional to 2,120.80, 3,181.20 and 1,942.60

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Solution

The fourth proportional to 2,120.80, 3,181.20 and 1,942.60 is: 2,913.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.80 : 3,181.20 = 1,942.60 : x
  2. Step 2: Convert to fraction form
    2,120.80/3,181.20 = 1,942.60/x
  3. Step 3: Cross multiply
    2,120.80x = 3,181.20 × 1,942.60
  4. Step 4: Simplify right side
    2,120.80x = 6,179,799.12
  5. Step 5: Solve for x
    x = 6,179,799.12/2,120.80
  6. Step 6: Final answer
    x = 2,913.90

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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.