Home / 21,939.75-30,276.66-12,379.70

Finding the Fourth Proportional to 21,939.75, 30,276.66 and 12,379.70

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Solution

The fourth proportional to 21,939.75, 30,276.66 and 12,379.70 is: 17,083.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,939.75 : 30,276.66 = 12,379.70 : x
  2. Step 2: Convert to fraction form
    21,939.75/30,276.66 = 12,379.70/x
  3. Step 3: Cross multiply
    21,939.75x = 30,276.66 × 12,379.70
  4. Step 4: Simplify right side
    21,939.75x = 374,815,905.90
  5. Step 5: Solve for x
    x = 374,815,905.90/21,939.75
  6. Step 6: Final answer
    x = 17,083.88

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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.