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Finding the Fourth Proportional to 13,791.95, 19,034.29 and 8,128.52

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Solution

The fourth proportional to 13,791.95, 19,034.29 and 8,128.52 is: 11,218.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,791.95 : 19,034.29 = 8,128.52 : x
  2. Step 2: Convert to fraction form
    13,791.95/19,034.29 = 8,128.52/x
  3. Step 3: Cross multiply
    13,791.95x = 19,034.29 × 8,128.52
  4. Step 4: Simplify right side
    13,791.95x = 154,720,494.93
  5. Step 5: Solve for x
    x = 154,720,494.93/13,791.95
  6. Step 6: Final answer
    x = 11,218.18

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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.