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Finding the Fourth Proportional to 19,608.39, 29,418.08 and 7,929.81

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Solution

The fourth proportional to 19,608.39, 29,418.08 and 7,929.81 is: 11,896.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,608.39 : 29,418.08 = 7,929.81 : x
  2. Step 2: Convert to fraction form
    19,608.39/29,418.08 = 7,929.81/x
  3. Step 3: Cross multiply
    19,608.39x = 29,418.08 × 7,929.81
  4. Step 4: Simplify right side
    19,608.39x = 233,279,745.32
  5. Step 5: Solve for x
    x = 233,279,745.32/19,608.39
  6. Step 6: Final answer
    x = 11,896.94

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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.