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Finding the Fourth Proportional to 20,991.99, 31,493.40 and 7,844.46

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Solution

The fourth proportional to 20,991.99, 31,493.40 and 7,844.46 is: 11,768.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.99 : 31,493.40 = 7,844.46 : x
  2. Step 2: Convert to fraction form
    20,991.99/31,493.40 = 7,844.46/x
  3. Step 3: Cross multiply
    20,991.99x = 31,493.40 × 7,844.46
  4. Step 4: Simplify right side
    20,991.99x = 247,048,716.56
  5. Step 5: Solve for x
    x = 247,048,716.56/20,991.99
  6. Step 6: Final answer
    x = 11,768.71

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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.