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Finding the Fourth Proportional to 18,771.78, 25,906.84 and 10,815.68

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Solution

The fourth proportional to 18,771.78, 25,906.84 and 10,815.68 is: 14,926.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,771.78 : 25,906.84 = 10,815.68 : x
  2. Step 2: Convert to fraction form
    18,771.78/25,906.84 = 10,815.68/x
  3. Step 3: Cross multiply
    18,771.78x = 25,906.84 × 10,815.68
  4. Step 4: Simplify right side
    18,771.78x = 280,200,091.25
  5. Step 5: Solve for x
    x = 280,200,091.25/18,771.78
  6. Step 6: Final answer
    x = 14,926.67

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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.