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Finding the Fourth Proportional to 18,995.56, 28,491.10 and 11,954.80

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Solution

The fourth proportional to 18,995.56, 28,491.10 and 11,954.80 is: 17,930.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,995.56 : 28,491.10 = 11,954.80 : x
  2. Step 2: Convert to fraction form
    18,995.56/28,491.10 = 11,954.80/x
  3. Step 3: Cross multiply
    18,995.56x = 28,491.10 × 11,954.80
  4. Step 4: Simplify right side
    18,995.56x = 340,605,402.28
  5. Step 5: Solve for x
    x = 340,605,402.28/18,995.56
  6. Step 6: Final answer
    x = 17,930.79

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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.