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Finding the Fourth Proportional to 21,896.75, 30,217.64 and 11,960.75

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Solution

The fourth proportional to 21,896.75, 30,217.64 and 11,960.75 is: 16,505.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,896.75 : 30,217.64 = 11,960.75 : x
  2. Step 2: Convert to fraction form
    21,896.75/30,217.64 = 11,960.75/x
  3. Step 3: Cross multiply
    21,896.75x = 30,217.64 × 11,960.75
  4. Step 4: Simplify right side
    21,896.75x = 361,425,577.83
  5. Step 5: Solve for x
    x = 361,425,577.83/21,896.75
  6. Step 6: Final answer
    x = 16,505.90

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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.