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Finding the Fourth Proportional to 7,120.20, 10,680.20 and 3,224.60

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Solution

The fourth proportional to 7,120.20, 10,680.20 and 3,224.60 is: 4,836.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,120.20 : 10,680.20 = 3,224.60 : x
  2. Step 2: Convert to fraction form
    7,120.20/10,680.20 = 3,224.60/x
  3. Step 3: Cross multiply
    7,120.20x = 10,680.20 × 3,224.60
  4. Step 4: Simplify right side
    7,120.20x = 34,439,372.92
  5. Step 5: Solve for x
    x = 34,439,372.92/7,120.20
  6. Step 6: Final answer
    x = 4,836.85

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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.