Home / 20,128.59-30,183.18-8,438.67

Finding the Fourth Proportional to 20,128.59, 30,183.18 and 8,438.67

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Solution

The fourth proportional to 20,128.59, 30,183.18 and 8,438.67 is: 12,653.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.59 : 30,183.18 = 8,438.67 : x
  2. Step 2: Convert to fraction form
    20,128.59/30,183.18 = 8,438.67/x
  3. Step 3: Cross multiply
    20,128.59x = 30,183.18 × 8,438.67
  4. Step 4: Simplify right side
    20,128.59x = 254,705,895.57
  5. Step 5: Solve for x
    x = 254,705,895.57/20,128.59
  6. Step 6: Final answer
    x = 12,653.94

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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.