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Finding the Fourth Proportional to 15,899.11, 21,940.86 and 8,729.33

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Solution

The fourth proportional to 15,899.11, 21,940.86 and 8,729.33 is: 12,046.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,899.11 : 21,940.86 = 8,729.33 : x
  2. Step 2: Convert to fraction form
    15,899.11/21,940.86 = 8,729.33/x
  3. Step 3: Cross multiply
    15,899.11x = 21,940.86 × 8,729.33
  4. Step 4: Simplify right side
    15,899.11x = 191,529,120.97
  5. Step 5: Solve for x
    x = 191,529,120.97/15,899.11
  6. Step 6: Final answer
    x = 12,046.53

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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.