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Finding the Fourth Proportional to 13,431.15, 18,518.32 and 8,945.07

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Solution

The fourth proportional to 13,431.15, 18,518.32 and 8,945.07 is: 12,333.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,431.15 : 18,518.32 = 8,945.07 : x
  2. Step 2: Convert to fraction form
    13,431.15/18,518.32 = 8,945.07/x
  3. Step 3: Cross multiply
    13,431.15x = 18,518.32 × 8,945.07
  4. Step 4: Simplify right side
    13,431.15x = 165,647,610.42
  5. Step 5: Solve for x
    x = 165,647,610.42/13,431.15
  6. Step 6: Final answer
    x = 12,333.09

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.