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Finding the Fourth Proportional to 13,620.51, 20,403.23 and 12,486.51

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Solution

The fourth proportional to 13,620.51, 20,403.23 and 12,486.51 is: 18,704.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,620.51 : 20,403.23 = 12,486.51 : x
  2. Step 2: Convert to fraction form
    13,620.51/20,403.23 = 12,486.51/x
  3. Step 3: Cross multiply
    13,620.51x = 20,403.23 × 12,486.51
  4. Step 4: Simplify right side
    13,620.51x = 254,765,072.99
  5. Step 5: Solve for x
    x = 254,765,072.99/13,620.51
  6. Step 6: Final answer
    x = 18,704.52

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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.