Home / 3,986.40-5,979.60-3,759.60

Finding the Fourth Proportional to 3,986.40, 5,979.60 and 3,759.60

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Solution

The fourth proportional to 3,986.40, 5,979.60 and 3,759.60 is: 5,639.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.40 : 5,979.60 = 3,759.60 : x
  2. Step 2: Convert to fraction form
    3,986.40/5,979.60 = 3,759.60/x
  3. Step 3: Cross multiply
    3,986.40x = 5,979.60 × 3,759.60
  4. Step 4: Simplify right side
    3,986.40x = 22,480,904.16
  5. Step 5: Solve for x
    x = 22,480,904.16/3,986.40
  6. Step 6: Final answer
    x = 5,639.40

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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.