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Finding the Fourth Proportional to 18,922.40, 28,399.80 and 8,408.60

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Solution

The fourth proportional to 18,922.40, 28,399.80 and 8,408.60 is: 12,620.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,922.40 : 28,399.80 = 8,408.60 : x
  2. Step 2: Convert to fraction form
    18,922.40/28,399.80 = 8,408.60/x
  3. Step 3: Cross multiply
    18,922.40x = 28,399.80 × 8,408.60
  4. Step 4: Simplify right side
    18,922.40x = 238,802,558.28
  5. Step 5: Solve for x
    x = 238,802,558.28/18,922.40
  6. Step 6: Final answer
    x = 12,620.10

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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.