Home / 2,121.20-3,181.80-1,383.10

Finding the Fourth Proportional to 2,121.20, 3,181.80 and 1,383.10

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Solution

The fourth proportional to 2,121.20, 3,181.80 and 1,383.10 is: 2,074.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.20 : 3,181.80 = 1,383.10 : x
  2. Step 2: Convert to fraction form
    2,121.20/3,181.80 = 1,383.10/x
  3. Step 3: Cross multiply
    2,121.20x = 3,181.80 × 1,383.10
  4. Step 4: Simplify right side
    2,121.20x = 4,400,747.58
  5. Step 5: Solve for x
    x = 4,400,747.58/2,121.20
  6. Step 6: Final answer
    x = 2,074.65

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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.