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Finding the Fourth Proportional to 19,791.33, 29,661.61 and 8,090.61

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Solution

The fourth proportional to 19,791.33, 29,661.61 and 8,090.61 is: 12,125.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,791.33 : 29,661.61 = 8,090.61 : x
  2. Step 2: Convert to fraction form
    19,791.33/29,661.61 = 8,090.61/x
  3. Step 3: Cross multiply
    19,791.33x = 29,661.61 × 8,090.61
  4. Step 4: Simplify right side
    19,791.33x = 239,980,518.48
  5. Step 5: Solve for x
    x = 239,980,518.48/19,791.33
  6. Step 6: Final answer
    x = 12,125.54

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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.