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Finding the Fourth Proportional to 20,620.44, 30,928.14 and 8,778.99

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Solution

The fourth proportional to 20,620.44, 30,928.14 and 8,778.99 is: 13,167.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.44 : 30,928.14 = 8,778.99 : x
  2. Step 2: Convert to fraction form
    20,620.44/30,928.14 = 8,778.99/x
  3. Step 3: Cross multiply
    20,620.44x = 30,928.14 × 8,778.99
  4. Step 4: Simplify right side
    20,620.44x = 271,517,831.78
  5. Step 5: Solve for x
    x = 271,517,831.78/20,620.44
  6. Step 6: Final answer
    x = 13,167.41

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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.