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Finding the Fourth Proportional to 13,791.59, 19,033.79 and 8,128.09

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Solution

The fourth proportional to 13,791.59, 19,033.79 and 8,128.09 is: 11,217.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,791.59 : 19,033.79 = 8,128.09 : x
  2. Step 2: Convert to fraction form
    13,791.59/19,033.79 = 8,128.09/x
  3. Step 3: Cross multiply
    13,791.59x = 19,033.79 × 8,128.09
  4. Step 4: Simplify right side
    13,791.59x = 154,708,358.16
  5. Step 5: Solve for x
    x = 154,708,358.16/13,791.59
  6. Step 6: Final answer
    x = 11,217.59

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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.