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Finding the Fourth Proportional to 13,919.63, 20,879.03 and 5,154.35

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Solution

The fourth proportional to 13,919.63, 20,879.03 and 5,154.35 is: 7,731.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,919.63 : 20,879.03 = 5,154.35 : x
  2. Step 2: Convert to fraction form
    13,919.63/20,879.03 = 5,154.35/x
  3. Step 3: Cross multiply
    13,919.63x = 20,879.03 × 5,154.35
  4. Step 4: Simplify right side
    13,919.63x = 107,617,736.77
  5. Step 5: Solve for x
    x = 107,617,736.77/13,919.63
  6. Step 6: Final answer
    x = 7,731.37

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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.