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Finding the Fourth Proportional to 21,641.46, 29,861.91 and 13,694.55

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Solution

The fourth proportional to 21,641.46, 29,861.91 and 13,694.55 is: 18,896.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,641.46 : 29,861.91 = 13,694.55 : x
  2. Step 2: Convert to fraction form
    21,641.46/29,861.91 = 13,694.55/x
  3. Step 3: Cross multiply
    21,641.46x = 29,861.91 × 13,694.55
  4. Step 4: Simplify right side
    21,641.46x = 408,945,419.59
  5. Step 5: Solve for x
    x = 408,945,419.59/21,641.46
  6. Step 6: Final answer
    x = 18,896.39

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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.