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Finding the Fourth Proportional to 13,879.60, 20,829.48 and 5,447.32

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Solution

The fourth proportional to 13,879.60, 20,829.48 and 5,447.32 is: 8,174.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,879.60 : 20,829.48 = 5,447.32 : x
  2. Step 2: Convert to fraction form
    13,879.60/20,829.48 = 5,447.32/x
  3. Step 3: Cross multiply
    13,879.60x = 20,829.48 × 5,447.32
  4. Step 4: Simplify right side
    13,879.60x = 113,464,842.99
  5. Step 5: Solve for x
    x = 113,464,842.99/13,879.60
  6. Step 6: Final answer
    x = 8,174.94

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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.