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Finding the Fourth Proportional to 18,791.75, 28,189.29 and 4,940.75

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Solution

The fourth proportional to 18,791.75, 28,189.29 and 4,940.75 is: 7,411.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,791.75 : 28,189.29 = 4,940.75 : x
  2. Step 2: Convert to fraction form
    18,791.75/28,189.29 = 4,940.75/x
  3. Step 3: Cross multiply
    18,791.75x = 28,189.29 × 4,940.75
  4. Step 4: Simplify right side
    18,791.75x = 139,276,234.57
  5. Step 5: Solve for x
    x = 139,276,234.57/18,791.75
  6. Step 6: Final answer
    x = 7,411.56

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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.