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Finding the Fourth Proportional to 28,890.12, 43,336.80 and 8,112

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Solution

The fourth proportional to 28,890.12, 43,336.80 and 8,112 is: 12,168.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,890.12 : 43,336.80 = 8,112 : x
  2. Step 2: Convert to fraction form
    28,890.12/43,336.80 = 8,112/x
  3. Step 3: Cross multiply
    28,890.12x = 43,336.80 × 8,112
  4. Step 4: Simplify right side
    28,890.12x = 351,548,121.60
  5. Step 5: Solve for x
    x = 351,548,121.60/28,890.12
  6. Step 6: Final answer
    x = 12,168.45

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.