Home / 20,997.75-31,499.87-7,851.99

Finding the Fourth Proportional to 20,997.75, 31,499.87 and 7,851.99

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Solution

The fourth proportional to 20,997.75, 31,499.87 and 7,851.99 is: 11,779.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,997.75 : 31,499.87 = 7,851.99 : x
  2. Step 2: Convert to fraction form
    20,997.75/31,499.87 = 7,851.99/x
  3. Step 3: Cross multiply
    20,997.75x = 31,499.87 × 7,851.99
  4. Step 4: Simplify right side
    20,997.75x = 247,336,624.98
  5. Step 5: Solve for x
    x = 247,336,624.98/20,997.75
  6. Step 6: Final answer
    x = 11,779.20

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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.