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Finding the Fourth Proportional to 21,940.88, 30,278.44 and 11,869.30

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Solution

The fourth proportional to 21,940.88, 30,278.44 and 11,869.30 is: 16,379.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,940.88 : 30,278.44 = 11,869.30 : x
  2. Step 2: Convert to fraction form
    21,940.88/30,278.44 = 11,869.30/x
  3. Step 3: Cross multiply
    21,940.88x = 30,278.44 × 11,869.30
  4. Step 4: Simplify right side
    21,940.88x = 359,383,887.89
  5. Step 5: Solve for x
    x = 359,383,887.89/21,940.88
  6. Step 6: Final answer
    x = 16,379.65

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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.