Home / 21,195.18-31,791.74-8,712.09

Finding the Fourth Proportional to 21,195.18, 31,791.74 and 8,712.09

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Solution

The fourth proportional to 21,195.18, 31,791.74 and 8,712.09 is: 13,067.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,195.18 : 31,791.74 = 8,712.09 : x
  2. Step 2: Convert to fraction form
    21,195.18/31,791.74 = 8,712.09/x
  3. Step 3: Cross multiply
    21,195.18x = 31,791.74 × 8,712.09
  4. Step 4: Simplify right side
    21,195.18x = 276,972,456.58
  5. Step 5: Solve for x
    x = 276,972,456.58/21,195.18
  6. Step 6: Final answer
    x = 13,067.71

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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.