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Finding the Fourth Proportional to 18,909.81, 28,379.83 and 8,522.37

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Solution

The fourth proportional to 18,909.81, 28,379.83 and 8,522.37 is: 12,790.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,909.81 : 28,379.83 = 8,522.37 : x
  2. Step 2: Convert to fraction form
    18,909.81/28,379.83 = 8,522.37/x
  3. Step 3: Cross multiply
    18,909.81x = 28,379.83 × 8,522.37
  4. Step 4: Simplify right side
    18,909.81x = 241,863,248.59
  5. Step 5: Solve for x
    x = 241,863,248.59/18,909.81
  6. Step 6: Final answer
    x = 12,790.36

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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.