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Finding the Fourth Proportional to 18,944.36, 28,406.50 and 8,409.80

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Solution

The fourth proportional to 18,944.36, 28,406.50 and 8,409.80 is: 12,610.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,944.36 : 28,406.50 = 8,409.80 : x
  2. Step 2: Convert to fraction form
    18,944.36/28,406.50 = 8,409.80/x
  3. Step 3: Cross multiply
    18,944.36x = 28,406.50 × 8,409.80
  4. Step 4: Simplify right side
    18,944.36x = 238,892,983.70
  5. Step 5: Solve for x
    x = 238,892,983.70/18,944.36
  6. Step 6: Final answer
    x = 12,610.24

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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.