Home / 3,912.99-5,399.88-2,120.45

Finding the Fourth Proportional to 3,912.99, 5,399.88 and 2,120.45

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Solution

The fourth proportional to 3,912.99, 5,399.88 and 2,120.45 is: 2,926.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,912.99 : 5,399.88 = 2,120.45 : x
  2. Step 2: Convert to fraction form
    3,912.99/5,399.88 = 2,120.45/x
  3. Step 3: Cross multiply
    3,912.99x = 5,399.88 × 2,120.45
  4. Step 4: Simplify right side
    3,912.99x = 11,450,148.55
  5. Step 5: Solve for x
    x = 11,450,148.55/3,912.99
  6. Step 6: Final answer
    x = 2,926.19

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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.