Home / 6,680.40-9,217.89-3,990.78

Finding the Fourth Proportional to 6,680.40, 9,217.89 and 3,990.78

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Solution

The fourth proportional to 6,680.40, 9,217.89 and 3,990.78 is: 5,506.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,680.40 : 9,217.89 = 3,990.78 : x
  2. Step 2: Convert to fraction form
    6,680.40/9,217.89 = 3,990.78/x
  3. Step 3: Cross multiply
    6,680.40x = 9,217.89 × 3,990.78
  4. Step 4: Simplify right side
    6,680.40x = 36,786,571.05
  5. Step 5: Solve for x
    x = 36,786,571.05/6,680.40
  6. Step 6: Final answer
    x = 5,506.64

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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.