Home / 3,912.60-5,399.36-2,120.07

Finding the Fourth Proportional to 3,912.60, 5,399.36 and 2,120.07

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Solution

The fourth proportional to 3,912.60, 5,399.36 and 2,120.07 is: 2,925.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,912.60 : 5,399.36 = 2,120.07 : x
  2. Step 2: Convert to fraction form
    3,912.60/5,399.36 = 2,120.07/x
  3. Step 3: Cross multiply
    3,912.60x = 5,399.36 × 2,120.07
  4. Step 4: Simplify right side
    3,912.60x = 11,447,038.75
  5. Step 5: Solve for x
    x = 11,447,038.75/3,912.60
  6. Step 6: Final answer
    x = 2,925.68

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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.