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Finding the Fourth Proportional to 13,879.88, 20,786.46 and 7,938.76

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Solution

The fourth proportional to 13,879.88, 20,786.46 and 7,938.76 is: 11,889.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,879.88 : 20,786.46 = 7,938.76 : x
  2. Step 2: Convert to fraction form
    13,879.88/20,786.46 = 7,938.76/x
  3. Step 3: Cross multiply
    13,879.88x = 20,786.46 × 7,938.76
  4. Step 4: Simplify right side
    13,879.88x = 165,018,674.43
  5. Step 5: Solve for x
    x = 165,018,674.43/13,879.88
  6. Step 6: Final answer
    x = 11,889.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.