Home / 20,121.41-30,172.39-8,431.49

Finding the Fourth Proportional to 20,121.41, 30,172.39 and 8,431.49

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Solution

The fourth proportional to 20,121.41, 30,172.39 and 8,431.49 is: 12,643.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,121.41 : 30,172.39 = 8,431.49 : x
  2. Step 2: Convert to fraction form
    20,121.41/30,172.39 = 8,431.49/x
  3. Step 3: Cross multiply
    20,121.41x = 30,172.39 × 8,431.49
  4. Step 4: Simplify right side
    20,121.41x = 254,398,204.56
  5. Step 5: Solve for x
    x = 254,398,204.56/20,121.41
  6. Step 6: Final answer
    x = 12,643.16

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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.