Home / 3,990.12-5,983.56-1,680

Finding the Fourth Proportional to 3,990.12, 5,983.56 and 1,680

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Solution

The fourth proportional to 3,990.12, 5,983.56 and 1,680 is: 2,519.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.12 : 5,983.56 = 1,680 : x
  2. Step 2: Convert to fraction form
    3,990.12/5,983.56 = 1,680/x
  3. Step 3: Cross multiply
    3,990.12x = 5,983.56 × 1,680
  4. Step 4: Simplify right side
    3,990.12x = 10,052,380.80
  5. Step 5: Solve for x
    x = 10,052,380.80/3,990.12
  6. Step 6: Final answer
    x = 2,519.32

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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.