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Finding the Fourth Proportional to 13,944.80, 20,917.20 and 13,296.80

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Solution

The fourth proportional to 13,944.80, 20,917.20 and 13,296.80 is: 19,945.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,944.80 : 20,917.20 = 13,296.80 : x
  2. Step 2: Convert to fraction form
    13,944.80/20,917.20 = 13,296.80/x
  3. Step 3: Cross multiply
    13,944.80x = 20,917.20 × 13,296.80
  4. Step 4: Simplify right side
    13,944.80x = 278,131,824.96
  5. Step 5: Solve for x
    x = 278,131,824.96/13,944.80
  6. Step 6: Final answer
    x = 19,945.20

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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.