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Finding the Fourth Proportional to 13,993.75, 20,991.84 and 3,605.50

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Solution

The fourth proportional to 13,993.75, 20,991.84 and 3,605.50 is: 5,408.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,993.75 : 20,991.84 = 3,605.50 : x
  2. Step 2: Convert to fraction form
    13,993.75/20,991.84 = 3,605.50/x
  3. Step 3: Cross multiply
    13,993.75x = 20,991.84 × 3,605.50
  4. Step 4: Simplify right side
    13,993.75x = 75,686,079.12
  5. Step 5: Solve for x
    x = 75,686,079.12/13,993.75
  6. Step 6: Final answer
    x = 5,408.56

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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.