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Finding the Fourth Proportional to 18,879.62, 28,323.99 and 13,343.78

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Solution

The fourth proportional to 18,879.62, 28,323.99 and 13,343.78 is: 20,018.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.62 : 28,323.99 = 13,343.78 : x
  2. Step 2: Convert to fraction form
    18,879.62/28,323.99 = 13,343.78/x
  3. Step 3: Cross multiply
    18,879.62x = 28,323.99 × 13,343.78
  4. Step 4: Simplify right side
    18,879.62x = 377,949,162.09
  5. Step 5: Solve for x
    x = 377,949,162.09/18,879.62
  6. Step 6: Final answer
    x = 20,018.89

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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.