Home / 3,109.58-4,289.33-1,990.12

Finding the Fourth Proportional to 3,109.58, 4,289.33 and 1,990.12

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Solution

The fourth proportional to 3,109.58, 4,289.33 and 1,990.12 is: 2,745.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,109.58 : 4,289.33 = 1,990.12 : x
  2. Step 2: Convert to fraction form
    3,109.58/4,289.33 = 1,990.12/x
  3. Step 3: Cross multiply
    3,109.58x = 4,289.33 × 1,990.12
  4. Step 4: Simplify right side
    3,109.58x = 8,536,250.02
  5. Step 5: Solve for x
    x = 8,536,250.02/3,109.58
  6. Step 6: Final answer
    x = 2,745.15

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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.