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Finding the Fourth Proportional to 13,791.91, 19,034.24 and 8,128.49

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Solution

The fourth proportional to 13,791.91, 19,034.24 and 8,128.49 is: 11,218.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,791.91 : 19,034.24 = 8,128.49 : x
  2. Step 2: Convert to fraction form
    13,791.91/19,034.24 = 8,128.49/x
  3. Step 3: Cross multiply
    13,791.91x = 19,034.24 × 8,128.49
  4. Step 4: Simplify right side
    13,791.91x = 154,719,564.87
  5. Step 5: Solve for x
    x = 154,719,564.87/13,791.91
  6. Step 6: Final answer
    x = 11,218.14

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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.