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Finding the Fourth Proportional to 13,892.10, 20,836.99 and 5,458.78

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Solution

The fourth proportional to 13,892.10, 20,836.99 and 5,458.78 is: 8,187.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,892.10 : 20,836.99 = 5,458.78 : x
  2. Step 2: Convert to fraction form
    13,892.10/20,836.99 = 5,458.78/x
  3. Step 3: Cross multiply
    13,892.10x = 20,836.99 × 5,458.78
  4. Step 4: Simplify right side
    13,892.10x = 113,744,544.27
  5. Step 5: Solve for x
    x = 113,744,544.27/13,892.10
  6. Step 6: Final answer
    x = 8,187.71

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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.