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Finding the Fourth Proportional to 13,300.80, 19,947.60 and 3,940.80

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Solution

The fourth proportional to 13,300.80, 19,947.60 and 3,940.80 is: 5,910.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,300.80 : 19,947.60 = 3,940.80 : x
  2. Step 2: Convert to fraction form
    13,300.80/19,947.60 = 3,940.80/x
  3. Step 3: Cross multiply
    13,300.80x = 19,947.60 × 3,940.80
  4. Step 4: Simplify right side
    13,300.80x = 78,609,502.08
  5. Step 5: Solve for x
    x = 78,609,502.08/13,300.80
  6. Step 6: Final answer
    x = 5,910.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.