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Finding the Fourth Proportional to 13,991.92, 20,982.94 and 4,128.56

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Solution

The fourth proportional to 13,991.92, 20,982.94 and 4,128.56 is: 6,191.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,991.92 : 20,982.94 = 4,128.56 : x
  2. Step 2: Convert to fraction form
    13,991.92/20,982.94 = 4,128.56/x
  3. Step 3: Cross multiply
    13,991.92x = 20,982.94 × 4,128.56
  4. Step 4: Simplify right side
    13,991.92x = 86,629,326.77
  5. Step 5: Solve for x
    x = 86,629,326.77/13,991.92
  6. Step 6: Final answer
    x = 6,191.38

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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.