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Finding the Fourth Proportional to 20,736.80, 28,620.78 and 13,662.80

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Solution

The fourth proportional to 20,736.80, 28,620.78 and 13,662.80 is: 18,857.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,736.80 : 28,620.78 = 13,662.80 : x
  2. Step 2: Convert to fraction form
    20,736.80/28,620.78 = 13,662.80/x
  3. Step 3: Cross multiply
    20,736.80x = 28,620.78 × 13,662.80
  4. Step 4: Simplify right side
    20,736.80x = 391,039,992.98
  5. Step 5: Solve for x
    x = 391,039,992.98/20,736.80
  6. Step 6: Final answer
    x = 18,857.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.