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Finding the Fourth Proportional to 18,906.66, 28,360.26 and 7,220.52

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Solution

The fourth proportional to 18,906.66, 28,360.26 and 7,220.52 is: 10,830.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,906.66 : 28,360.26 = 7,220.52 : x
  2. Step 2: Convert to fraction form
    18,906.66/28,360.26 = 7,220.52/x
  3. Step 3: Cross multiply
    18,906.66x = 28,360.26 × 7,220.52
  4. Step 4: Simplify right side
    18,906.66x = 204,775,824.54
  5. Step 5: Solve for x
    x = 204,775,824.54/18,906.66
  6. Step 6: Final answer
    x = 10,830.88

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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.