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Finding the Fourth Proportional to 21,940.98, 30,272.49 and 12,739.20

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Solution

The fourth proportional to 21,940.98, 30,272.49 and 12,739.20 is: 17,576.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,940.98 : 30,272.49 = 12,739.20 : x
  2. Step 2: Convert to fraction form
    21,940.98/30,272.49 = 12,739.20/x
  3. Step 3: Cross multiply
    21,940.98x = 30,272.49 × 12,739.20
  4. Step 4: Simplify right side
    21,940.98x = 385,647,304.61
  5. Step 5: Solve for x
    x = 385,647,304.61/21,940.98
  6. Step 6: Final answer
    x = 17,576.58

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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.