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Finding the Fourth Proportional to 13,893.90, 20,836 and 8,620.80

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Solution

The fourth proportional to 13,893.90, 20,836 and 8,620.80 is: 12,928.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,893.90 : 20,836 = 8,620.80 : x
  2. Step 2: Convert to fraction form
    13,893.90/20,836 = 8,620.80/x
  3. Step 3: Cross multiply
    13,893.90x = 20,836 × 8,620.80
  4. Step 4: Simplify right side
    13,893.90x = 179,622,988.80
  5. Step 5: Solve for x
    x = 179,622,988.80/13,893.90
  6. Step 6: Final answer
    x = 12,928.19

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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.