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Finding the Fourth Proportional to 13,704.13, 18,911.69 and 8,115.13

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Solution

The fourth proportional to 13,704.13, 18,911.69 and 8,115.13 is: 11,198.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,704.13 : 18,911.69 = 8,115.13 : x
  2. Step 2: Convert to fraction form
    13,704.13/18,911.69 = 8,115.13/x
  3. Step 3: Cross multiply
    13,704.13x = 18,911.69 × 8,115.13
  4. Step 4: Simplify right side
    13,704.13x = 153,470,822.87
  5. Step 5: Solve for x
    x = 153,470,822.87/13,704.13
  6. Step 6: Final answer
    x = 11,198.87

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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.