Home / 3,109.45-4,289.15-1,989.99

Finding the Fourth Proportional to 3,109.45, 4,289.15 and 1,989.99

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Solution

The fourth proportional to 3,109.45, 4,289.15 and 1,989.99 is: 2,744.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,109.45 : 4,289.15 = 1,989.99 : x
  2. Step 2: Convert to fraction form
    3,109.45/4,289.15 = 1,989.99/x
  3. Step 3: Cross multiply
    3,109.45x = 4,289.15 × 1,989.99
  4. Step 4: Simplify right side
    3,109.45x = 8,535,370.58
  5. Step 5: Solve for x
    x = 8,535,370.58/3,109.45
  6. Step 6: Final answer
    x = 2,744.98

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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.