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Finding the Fourth Proportional to 20,512.80, 30,747.60 and 11,728.80

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Solution

The fourth proportional to 20,512.80, 30,747.60 and 11,728.80 is: 17,580.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,512.80 : 30,747.60 = 11,728.80 : x
  2. Step 2: Convert to fraction form
    20,512.80/30,747.60 = 11,728.80/x
  3. Step 3: Cross multiply
    20,512.80x = 30,747.60 × 11,728.80
  4. Step 4: Simplify right side
    20,512.80x = 360,632,450.88
  5. Step 5: Solve for x
    x = 360,632,450.88/20,512.80
  6. Step 6: Final answer
    x = 17,580.85

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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.