Home / 20,121.21-30,222.06-12,131.97

Finding the Fourth Proportional to 20,121.21, 30,222.06 and 12,131.97

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Solution

The fourth proportional to 20,121.21, 30,222.06 and 12,131.97 is: 18,222.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,121.21 : 30,222.06 = 12,131.97 : x
  2. Step 2: Convert to fraction form
    20,121.21/30,222.06 = 12,131.97/x
  3. Step 3: Cross multiply
    20,121.21x = 30,222.06 × 12,131.97
  4. Step 4: Simplify right side
    20,121.21x = 366,653,064.60
  5. Step 5: Solve for x
    x = 366,653,064.60/20,121.21
  6. Step 6: Final answer
    x = 18,222.22

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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.