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Finding the Fourth Proportional to 20,628.30, 30,942.42 and 7,480.64

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Solution

The fourth proportional to 20,628.30, 30,942.42 and 7,480.64 is: 11,220.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,628.30 : 30,942.42 = 7,480.64 : x
  2. Step 2: Convert to fraction form
    20,628.30/30,942.42 = 7,480.64/x
  3. Step 3: Cross multiply
    20,628.30x = 30,942.42 × 7,480.64
  4. Step 4: Simplify right side
    20,628.30x = 231,469,104.75
  5. Step 5: Solve for x
    x = 231,469,104.75/20,628.30
  6. Step 6: Final answer
    x = 11,220.95

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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.