Home / 21,912.75-30,245.07-12,486.78

Finding the Fourth Proportional to 21,912.75, 30,245.07 and 12,486.78

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Solution

The fourth proportional to 21,912.75, 30,245.07 and 12,486.78 is: 17,234.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,912.75 : 30,245.07 = 12,486.78 : x
  2. Step 2: Convert to fraction form
    21,912.75/30,245.07 = 12,486.78/x
  3. Step 3: Cross multiply
    21,912.75x = 30,245.07 × 12,486.78
  4. Step 4: Simplify right side
    21,912.75x = 377,663,535.17
  5. Step 5: Solve for x
    x = 377,663,535.17/21,912.75
  6. Step 6: Final answer
    x = 17,234.88

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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.