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Finding the Fourth Proportional to 20,919.75, 28,872.90 and 11,967.63

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Solution

The fourth proportional to 20,919.75, 28,872.90 and 11,967.63 is: 16,517.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.75 : 28,872.90 = 11,967.63 : x
  2. Step 2: Convert to fraction form
    20,919.75/28,872.90 = 11,967.63/x
  3. Step 3: Cross multiply
    20,919.75x = 28,872.90 × 11,967.63
  4. Step 4: Simplify right side
    20,919.75x = 345,540,184.23
  5. Step 5: Solve for x
    x = 345,540,184.23/20,919.75
  6. Step 6: Final answer
    x = 16,517.41

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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.