Home / 13,891.32-20,919.60-12,520.80

Finding the Fourth Proportional to 13,891.32, 20,919.60 and 12,520.80

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Solution

The fourth proportional to 13,891.32, 20,919.60 and 12,520.80 is: 18,855.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,891.32 : 20,919.60 = 12,520.80 : x
  2. Step 2: Convert to fraction form
    13,891.32/20,919.60 = 12,520.80/x
  3. Step 3: Cross multiply
    13,891.32x = 20,919.60 × 12,520.80
  4. Step 4: Simplify right side
    13,891.32x = 261,930,127.68
  5. Step 5: Solve for x
    x = 261,930,127.68/13,891.32
  6. Step 6: Final answer
    x = 18,855.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.