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Finding the Fourth Proportional to 19,940.80, 29,911.20 and 18,968.80

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Solution

The fourth proportional to 19,940.80, 29,911.20 and 18,968.80 is: 28,453.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,940.80 : 29,911.20 = 18,968.80 : x
  2. Step 2: Convert to fraction form
    19,940.80/29,911.20 = 18,968.80/x
  3. Step 3: Cross multiply
    19,940.80x = 29,911.20 × 18,968.80
  4. Step 4: Simplify right side
    19,940.80x = 567,379,570.56
  5. Step 5: Solve for x
    x = 567,379,570.56/19,940.80
  6. Step 6: Final answer
    x = 28,453.20

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1.5x scale

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.