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Finding the Fourth Proportional to 19,719.99, 27,212.52 and 11,221.86

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Solution

The fourth proportional to 19,719.99, 27,212.52 and 11,221.86 is: 15,485.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,719.99 : 27,212.52 = 11,221.86 : x
  2. Step 2: Convert to fraction form
    19,719.99/27,212.52 = 11,221.86/x
  3. Step 3: Cross multiply
    19,719.99x = 27,212.52 × 11,221.86
  4. Step 4: Simplify right side
    19,719.99x = 305,375,089.69
  5. Step 5: Solve for x
    x = 305,375,089.69/19,719.99
  6. Step 6: Final answer
    x = 15,485.56

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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.