Home / 20,131.27-30,208.78-7,661.79

Finding the Fourth Proportional to 20,131.27, 30,208.78 and 7,661.79

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Solution

The fourth proportional to 20,131.27, 30,208.78 and 7,661.79 is: 11,497.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,131.27 : 30,208.78 = 7,661.79 : x
  2. Step 2: Convert to fraction form
    20,131.27/30,208.78 = 7,661.79/x
  3. Step 3: Cross multiply
    20,131.27x = 30,208.78 × 7,661.79
  4. Step 4: Simplify right side
    20,131.27x = 231,453,338.09
  5. Step 5: Solve for x
    x = 231,453,338.09/20,131.27
  6. Step 6: Final answer
    x = 11,497.21

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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.