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Finding the Fourth Proportional to 18,890.44, 28,339.04 and 7,790.96

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Solution

The fourth proportional to 18,890.44, 28,339.04 and 7,790.96 is: 11,687.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,890.44 : 28,339.04 = 7,790.96 : x
  2. Step 2: Convert to fraction form
    18,890.44/28,339.04 = 7,790.96/x
  3. Step 3: Cross multiply
    18,890.44x = 28,339.04 × 7,790.96
  4. Step 4: Simplify right side
    18,890.44x = 220,788,327.08
  5. Step 5: Solve for x
    x = 220,788,327.08/18,890.44
  6. Step 6: Final answer
    x = 11,687.83

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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.