Home / 20,129.70-30,163.76-8,436.54

Finding the Fourth Proportional to 20,129.70, 30,163.76 and 8,436.54

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Solution

The fourth proportional to 20,129.70, 30,163.76 and 8,436.54 is: 12,641.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,129.70 : 30,163.76 = 8,436.54 : x
  2. Step 2: Convert to fraction form
    20,129.70/30,163.76 = 8,436.54/x
  3. Step 3: Cross multiply
    20,129.70x = 30,163.76 × 8,436.54
  4. Step 4: Simplify right side
    20,129.70x = 254,477,767.79
  5. Step 5: Solve for x
    x = 254,477,767.79/20,129.70
  6. Step 6: Final answer
    x = 12,641.91

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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.