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Finding the Fourth Proportional to 18,991.55, 28,465.60 and 11,879.02

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Solution

The fourth proportional to 18,991.55, 28,465.60 and 11,879.02 is: 17,804.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.55 : 28,465.60 = 11,879.02 : x
  2. Step 2: Convert to fraction form
    18,991.55/28,465.60 = 11,879.02/x
  3. Step 3: Cross multiply
    18,991.55x = 28,465.60 × 11,879.02
  4. Step 4: Simplify right side
    18,991.55x = 338,143,431.71
  5. Step 5: Solve for x
    x = 338,143,431.71/18,991.55
  6. Step 6: Final answer
    x = 17,804.94

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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.