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Finding the Fourth Proportional to 13,819.27, 20,728.90 and 3,431.02

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Solution

The fourth proportional to 13,819.27, 20,728.90 and 3,431.02 is: 5,146.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,819.27 : 20,728.90 = 3,431.02 : x
  2. Step 2: Convert to fraction form
    13,819.27/20,728.90 = 3,431.02/x
  3. Step 3: Cross multiply
    13,819.27x = 20,728.90 × 3,431.02
  4. Step 4: Simplify right side
    13,819.27x = 71,121,268.24
  5. Step 5: Solve for x
    x = 71,121,268.24/13,819.27
  6. Step 6: Final answer
    x = 5,146.53

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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.