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Finding the Fourth Proportional to 19,222.71, 28,820.22 and 11,811.85

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Solution

The fourth proportional to 19,222.71, 28,820.22 and 11,811.85 is: 17,709.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,222.71 : 28,820.22 = 11,811.85 : x
  2. Step 2: Convert to fraction form
    19,222.71/28,820.22 = 11,811.85/x
  3. Step 3: Cross multiply
    19,222.71x = 28,820.22 × 11,811.85
  4. Step 4: Simplify right side
    19,222.71x = 340,420,194.60
  5. Step 5: Solve for x
    x = 340,420,194.60/19,222.71
  6. Step 6: Final answer
    x = 17,709.28

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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.