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Finding the Fourth Proportional to 18,759.98, 28,119.72 and 12,190.88

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Solution

The fourth proportional to 18,759.98, 28,119.72 and 12,190.88 is: 18,273.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,759.98 : 28,119.72 = 12,190.88 : x
  2. Step 2: Convert to fraction form
    18,759.98/28,119.72 = 12,190.88/x
  3. Step 3: Cross multiply
    18,759.98x = 28,119.72 × 12,190.88
  4. Step 4: Simplify right side
    18,759.98x = 342,804,132.15
  5. Step 5: Solve for x
    x = 342,804,132.15/18,759.98
  6. Step 6: Final answer
    x = 18,273.16

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.