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Finding the Fourth Proportional to 21,892.75, 30,212.72 and 11,956.75

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Solution

The fourth proportional to 21,892.75, 30,212.72 and 11,956.75 is: 16,500.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,892.75 : 30,212.72 = 11,956.75 : x
  2. Step 2: Convert to fraction form
    21,892.75/30,212.72 = 11,956.75/x
  3. Step 3: Cross multiply
    21,892.75x = 30,212.72 × 11,956.75
  4. Step 4: Simplify right side
    21,892.75x = 361,245,939.86
  5. Step 5: Solve for x
    x = 361,245,939.86/21,892.75
  6. Step 6: Final answer
    x = 16,500.71

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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.