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Finding the Fourth Proportional to 13,218.97, 18,238.48 and 8,505.98

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Solution

The fourth proportional to 13,218.97, 18,238.48 and 8,505.98 is: 11,735.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,218.97 : 18,238.48 = 8,505.98 : x
  2. Step 2: Convert to fraction form
    13,218.97/18,238.48 = 8,505.98/x
  3. Step 3: Cross multiply
    13,218.97x = 18,238.48 × 8,505.98
  4. Step 4: Simplify right side
    13,218.97x = 155,136,170.44
  5. Step 5: Solve for x
    x = 155,136,170.44/13,218.97
  6. Step 6: Final answer
    x = 11,735.88

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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.