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Finding the Fourth Proportional to 21,855.99, 30,161.21 and 12,295.88

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Solution

The fourth proportional to 21,855.99, 30,161.21 and 12,295.88 is: 16,968.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,855.99 : 30,161.21 = 12,295.88 : x
  2. Step 2: Convert to fraction form
    21,855.99/30,161.21 = 12,295.88/x
  3. Step 3: Cross multiply
    21,855.99x = 30,161.21 × 12,295.88
  4. Step 4: Simplify right side
    21,855.99x = 370,858,503.97
  5. Step 5: Solve for x
    x = 370,858,503.97/21,855.99
  6. Step 6: Final answer
    x = 16,968.28

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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.