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Finding the Fourth Proportional to 18,745.08, 28,089.87 and 8,205.36

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Solution

The fourth proportional to 18,745.08, 28,089.87 and 8,205.36 is: 12,295.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,745.08 : 28,089.87 = 8,205.36 : x
  2. Step 2: Convert to fraction form
    18,745.08/28,089.87 = 8,205.36/x
  3. Step 3: Cross multiply
    18,745.08x = 28,089.87 × 8,205.36
  4. Step 4: Simplify right side
    18,745.08x = 230,487,495.70
  5. Step 5: Solve for x
    x = 230,487,495.70/18,745.08
  6. Step 6: Final answer
    x = 12,295.89

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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.