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Finding the Fourth Proportional to 13,419.99, 20,112.60 and 5,513.55

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Solution

The fourth proportional to 13,419.99, 20,112.60 and 5,513.55 is: 8,263.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,419.99 : 20,112.60 = 5,513.55 : x
  2. Step 2: Convert to fraction form
    13,419.99/20,112.60 = 5,513.55/x
  3. Step 3: Cross multiply
    13,419.99x = 20,112.60 × 5,513.55
  4. Step 4: Simplify right side
    13,419.99x = 110,891,825.73
  5. Step 5: Solve for x
    x = 110,891,825.73/13,419.99
  6. Step 6: Final answer
    x = 8,263.18

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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.