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Finding the Fourth Proportional to 20,628.32, 30,942.41 and 7,480.67

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Solution

The fourth proportional to 20,628.32, 30,942.41 and 7,480.67 is: 11,220.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,628.32 : 30,942.41 = 7,480.67 : x
  2. Step 2: Convert to fraction form
    20,628.32/30,942.41 = 7,480.67/x
  3. Step 3: Cross multiply
    20,628.32x = 30,942.41 × 7,480.67
  4. Step 4: Simplify right side
    20,628.32x = 231,469,766.10
  5. Step 5: Solve for x
    x = 231,469,766.10/20,628.32
  6. Step 6: Final answer
    x = 11,220.97

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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.