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Finding the Fourth Proportional to 21,704.40, 29,940.12 and 12,747.60

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Solution

The fourth proportional to 21,704.40, 29,940.12 and 12,747.60 is: 17,584.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,704.40 : 29,940.12 = 12,747.60 : x
  2. Step 2: Convert to fraction form
    21,704.40/29,940.12 = 12,747.60/x
  3. Step 3: Cross multiply
    21,704.40x = 29,940.12 × 12,747.60
  4. Step 4: Simplify right side
    21,704.40x = 381,664,673.71
  5. Step 5: Solve for x
    x = 381,664,673.71/21,704.40
  6. Step 6: Final answer
    x = 17,584.67

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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.