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Finding the Fourth Proportional to 39,571, 54,608 and 21,907

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Solution

The fourth proportional to 39,571, 54,608 and 21,907 is: 30,231.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,571 : 54,608 = 21,907 : x
  2. Step 2: Convert to fraction form
    39,571/54,608 = 21,907/x
  3. Step 3: Cross multiply
    39,571x = 54,608 × 21,907
  4. Step 4: Simplify right side
    39,571x = 1,196,297,456
  5. Step 5: Solve for x
    x = 1,196,297,456/39,571
  6. Step 6: Final answer
    x = 30,231.67

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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.