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Finding the Fourth Proportional to 13,993.26, 20,989.90 and 4,759.26

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Solution

The fourth proportional to 13,993.26, 20,989.90 and 4,759.26 is: 7,138.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,993.26 : 20,989.90 = 4,759.26 : x
  2. Step 2: Convert to fraction form
    13,993.26/20,989.90 = 4,759.26/x
  3. Step 3: Cross multiply
    13,993.26x = 20,989.90 × 4,759.26
  4. Step 4: Simplify right side
    13,993.26x = 99,896,391.47
  5. Step 5: Solve for x
    x = 99,896,391.47/13,993.26
  6. Step 6: Final answer
    x = 7,138.89

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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.