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Finding the Fourth Proportional to 28,775.70, 43,163.64 and 7,999.20

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Solution

The fourth proportional to 28,775.70, 43,163.64 and 7,999.20 is: 11,998.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,775.70 : 43,163.64 = 7,999.20 : x
  2. Step 2: Convert to fraction form
    28,775.70/43,163.64 = 7,999.20/x
  3. Step 3: Cross multiply
    28,775.70x = 43,163.64 × 7,999.20
  4. Step 4: Simplify right side
    28,775.70x = 345,274,589.09
  5. Step 5: Solve for x
    x = 345,274,589.09/28,775.70
  6. Step 6: Final answer
    x = 11,998.83

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1.5x scale

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.