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Finding the Fourth Proportional to 18,879.05, 28,321.99 and 7,779.57

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Solution

The fourth proportional to 18,879.05, 28,321.99 and 7,779.57 is: 11,670.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.05 : 28,321.99 = 7,779.57 : x
  2. Step 2: Convert to fraction form
    18,879.05/28,321.99 = 7,779.57/x
  3. Step 3: Cross multiply
    18,879.05x = 28,321.99 × 7,779.57
  4. Step 4: Simplify right side
    18,879.05x = 220,332,884.30
  5. Step 5: Solve for x
    x = 220,332,884.30/18,879.05
  6. Step 6: Final answer
    x = 11,670.76

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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.