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Finding the Fourth Proportional to 13,759.55, 18,989.13 and 7,791.26

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Solution

The fourth proportional to 13,759.55, 18,989.13 and 7,791.26 is: 10,752.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,759.55 : 18,989.13 = 7,791.26 : x
  2. Step 2: Convert to fraction form
    13,759.55/18,989.13 = 7,791.26/x
  3. Step 3: Cross multiply
    13,759.55x = 18,989.13 × 7,791.26
  4. Step 4: Simplify right side
    13,759.55x = 147,949,249.00
  5. Step 5: Solve for x
    x = 147,949,249.00/13,759.55
  6. Step 6: Final answer
    x = 10,752.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.