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Finding the Fourth Proportional to 20,906.87, 28,811.64 and 20,522.58

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Solution

The fourth proportional to 20,906.87, 28,811.64 and 20,522.58 is: 28,282.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,906.87 : 28,811.64 = 20,522.58 : x
  2. Step 2: Convert to fraction form
    20,906.87/28,811.64 = 20,522.58/x
  3. Step 3: Cross multiply
    20,906.87x = 28,811.64 × 20,522.58
  4. Step 4: Simplify right side
    20,906.87x = 591,289,078.79
  5. Step 5: Solve for x
    x = 591,289,078.79/20,906.87
  6. Step 6: Final answer
    x = 28,282.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.