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Finding the Fourth Proportional to 30,978.45, 46,469.46 and 8,790.09

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Solution

The fourth proportional to 30,978.45, 46,469.46 and 8,790.09 is: 13,185.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,978.45 : 46,469.46 = 8,790.09 : x
  2. Step 2: Convert to fraction form
    30,978.45/46,469.46 = 8,790.09/x
  3. Step 3: Cross multiply
    30,978.45x = 46,469.46 × 8,790.09
  4. Step 4: Simplify right side
    30,978.45x = 408,470,735.65
  5. Step 5: Solve for x
    x = 408,470,735.65/30,978.45
  6. Step 6: Final answer
    x = 13,185.64

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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.