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Finding the Fourth Proportional to 18,791.53, 28,192.70 and 8,917.23

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Solution

The fourth proportional to 18,791.53, 28,192.70 and 8,917.23 is: 13,378.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,791.53 : 28,192.70 = 8,917.23 : x
  2. Step 2: Convert to fraction form
    18,791.53/28,192.70 = 8,917.23/x
  3. Step 3: Cross multiply
    18,791.53x = 28,192.70 × 8,917.23
  4. Step 4: Simplify right side
    18,791.53x = 251,400,790.22
  5. Step 5: Solve for x
    x = 251,400,790.22/18,791.53
  6. Step 6: Final answer
    x = 13,378.41

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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.