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Finding the Fourth Proportional to 13,199.88, 18,212.88 and 7,893.84

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Solution

The fourth proportional to 13,199.88, 18,212.88 and 7,893.84 is: 10,891.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,199.88 : 18,212.88 = 7,893.84 : x
  2. Step 2: Convert to fraction form
    13,199.88/18,212.88 = 7,893.84/x
  3. Step 3: Cross multiply
    13,199.88x = 18,212.88 × 7,893.84
  4. Step 4: Simplify right side
    13,199.88x = 143,769,560.66
  5. Step 5: Solve for x
    x = 143,769,560.66/13,199.88
  6. Step 6: Final answer
    x = 10,891.73

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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.