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Finding the Fourth Proportional to 14,619.69, 20,163.78 and 13,428.36

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Solution

The fourth proportional to 14,619.69, 20,163.78 and 13,428.36 is: 18,520.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,619.69 : 20,163.78 = 13,428.36 : x
  2. Step 2: Convert to fraction form
    14,619.69/20,163.78 = 13,428.36/x
  3. Step 3: Cross multiply
    14,619.69x = 20,163.78 × 13,428.36
  4. Step 4: Simplify right side
    14,619.69x = 270,766,496.80
  5. Step 5: Solve for x
    x = 270,766,496.80/14,619.69
  6. Step 6: Final answer
    x = 18,520.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.