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Finding the Fourth Proportional to 15,791.01, 21,790.78 and 8,716.06

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Solution

The fourth proportional to 15,791.01, 21,790.78 and 8,716.06 is: 12,027.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,791.01 : 21,790.78 = 8,716.06 : x
  2. Step 2: Convert to fraction form
    15,791.01/21,790.78 = 8,716.06/x
  3. Step 3: Cross multiply
    15,791.01x = 21,790.78 × 8,716.06
  4. Step 4: Simplify right side
    15,791.01x = 189,929,745.93
  5. Step 5: Solve for x
    x = 189,929,745.93/15,791.01
  6. Step 6: Final answer
    x = 12,027.71

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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.