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Finding the Fourth Proportional to 13,638.53, 18,817.11 and 8,262.97

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Solution

The fourth proportional to 13,638.53, 18,817.11 and 8,262.97 is: 11,400.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,638.53 : 18,817.11 = 8,262.97 : x
  2. Step 2: Convert to fraction form
    13,638.53/18,817.11 = 8,262.97/x
  3. Step 3: Cross multiply
    13,638.53x = 18,817.11 × 8,262.97
  4. Step 4: Simplify right side
    13,638.53x = 155,485,168.37
  5. Step 5: Solve for x
    x = 155,485,168.37/13,638.53
  6. Step 6: Final answer
    x = 11,400.43

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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.