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Finding the Fourth Proportional to 13,879.19, 20,826.93 and 5,120.21

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Solution

The fourth proportional to 13,879.19, 20,826.93 and 5,120.21 is: 7,683.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,879.19 : 20,826.93 = 5,120.21 : x
  2. Step 2: Convert to fraction form
    13,879.19/20,826.93 = 5,120.21/x
  3. Step 3: Cross multiply
    13,879.19x = 20,826.93 × 5,120.21
  4. Step 4: Simplify right side
    13,879.19x = 106,638,255.26
  5. Step 5: Solve for x
    x = 106,638,255.26/13,879.19
  6. Step 6: Final answer
    x = 7,683.32

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1.5x scale

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.