Home / 3,990.12-5,979.60-2,528.40

Finding the Fourth Proportional to 3,990.12, 5,979.60 and 2,528.40

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Solution

The fourth proportional to 3,990.12, 5,979.60 and 2,528.40 is: 3,789.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.12 : 5,979.60 = 2,528.40 : x
  2. Step 2: Convert to fraction form
    3,990.12/5,979.60 = 2,528.40/x
  3. Step 3: Cross multiply
    3,990.12x = 5,979.60 × 2,528.40
  4. Step 4: Simplify right side
    3,990.12x = 15,118,820.64
  5. Step 5: Solve for x
    x = 15,118,820.64/3,990.12
  6. Step 6: Final answer
    x = 3,789.06

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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.