Home / 3,186.40-4,399.40-1,991.85

Finding the Fourth Proportional to 3,186.40, 4,399.40 and 1,991.85

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Solution

The fourth proportional to 3,186.40, 4,399.40 and 1,991.85 is: 2,750.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,186.40 : 4,399.40 = 1,991.85 : x
  2. Step 2: Convert to fraction form
    3,186.40/4,399.40 = 1,991.85/x
  3. Step 3: Cross multiply
    3,186.40x = 4,399.40 × 1,991.85
  4. Step 4: Simplify right side
    3,186.40x = 8,762,934.93
  5. Step 5: Solve for x
    x = 8,762,934.93/3,186.40
  6. Step 6: Final answer
    x = 2,750.11

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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.