Home / 3,115.28-4,299.99-1,999.20

Finding the Fourth Proportional to 3,115.28, 4,299.99 and 1,999.20

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Solution

The fourth proportional to 3,115.28, 4,299.99 and 1,999.20 is: 2,759.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,115.28 : 4,299.99 = 1,999.20 : x
  2. Step 2: Convert to fraction form
    3,115.28/4,299.99 = 1,999.20/x
  3. Step 3: Cross multiply
    3,115.28x = 4,299.99 × 1,999.20
  4. Step 4: Simplify right side
    3,115.28x = 8,596,540.01
  5. Step 5: Solve for x
    x = 8,596,540.01/3,115.28
  6. Step 6: Final answer
    x = 2,759.48

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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.