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Finding the Fourth Proportional to 18,933.20, 28,375.80 and 7,230.80

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Solution

The fourth proportional to 18,933.20, 28,375.80 and 7,230.80 is: 10,837.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,933.20 : 28,375.80 = 7,230.80 : x
  2. Step 2: Convert to fraction form
    18,933.20/28,375.80 = 7,230.80/x
  3. Step 3: Cross multiply
    18,933.20x = 28,375.80 × 7,230.80
  4. Step 4: Simplify right side
    18,933.20x = 205,179,734.64
  5. Step 5: Solve for x
    x = 205,179,734.64/18,933.20
  6. Step 6: Final answer
    x = 10,837.03

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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.