Home / 3,980.40-5,958.45-3,105.60

Finding the Fourth Proportional to 3,980.40, 5,958.45 and 3,105.60

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Solution

The fourth proportional to 3,980.40, 5,958.45 and 3,105.60 is: 4,648.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,980.40 : 5,958.45 = 3,105.60 : x
  2. Step 2: Convert to fraction form
    3,980.40/5,958.45 = 3,105.60/x
  3. Step 3: Cross multiply
    3,980.40x = 5,958.45 × 3,105.60
  4. Step 4: Simplify right side
    3,980.40x = 18,504,562.32
  5. Step 5: Solve for x
    x = 18,504,562.32/3,980.40
  6. Step 6: Final answer
    x = 4,648.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.