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Finding the Fourth Proportional to 15,790.54, 21,791.12 and 8,716.96

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Solution

The fourth proportional to 15,790.54, 21,791.12 and 8,716.96 is: 12,029.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,790.54 : 21,791.12 = 8,716.96 : x
  2. Step 2: Convert to fraction form
    15,790.54/21,791.12 = 8,716.96/x
  3. Step 3: Cross multiply
    15,790.54x = 21,791.12 × 8,716.96
  4. Step 4: Simplify right side
    15,790.54x = 189,952,321.40
  5. Step 5: Solve for x
    x = 189,952,321.40/15,790.54
  6. Step 6: Final answer
    x = 12,029.50

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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.