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Finding the Fourth Proportional to 13,618.80, 20,416.86 and 5,296.86

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Solution

The fourth proportional to 13,618.80, 20,416.86 and 5,296.86 is: 7,940.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,618.80 : 20,416.86 = 5,296.86 : x
  2. Step 2: Convert to fraction form
    13,618.80/20,416.86 = 5,296.86/x
  3. Step 3: Cross multiply
    13,618.80x = 20,416.86 × 5,296.86
  4. Step 4: Simplify right side
    13,618.80x = 108,145,249.06
  5. Step 5: Solve for x
    x = 108,145,249.06/13,618.80
  6. Step 6: Final answer
    x = 7,940.88

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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.