Home / 3,109.94-4,289.84-1,990.50

Finding the Fourth Proportional to 3,109.94, 4,289.84 and 1,990.50

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Solution

The fourth proportional to 3,109.94, 4,289.84 and 1,990.50 is: 2,745.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,109.94 : 4,289.84 = 1,990.50 : x
  2. Step 2: Convert to fraction form
    3,109.94/4,289.84 = 1,990.50/x
  3. Step 3: Cross multiply
    3,109.94x = 4,289.84 × 1,990.50
  4. Step 4: Simplify right side
    3,109.94x = 8,538,926.52
  5. Step 5: Solve for x
    x = 8,538,926.52/3,109.94
  6. Step 6: Final answer
    x = 2,745.69

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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.