Home / 21,163.90-31,718-11,808.33

Finding the Fourth Proportional to 21,163.90, 31,718 and 11,808.33

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Solution

The fourth proportional to 21,163.90, 31,718 and 11,808.33 is: 17,696.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,163.90 : 31,718 = 11,808.33 : x
  2. Step 2: Convert to fraction form
    21,163.90/31,718 = 11,808.33/x
  3. Step 3: Cross multiply
    21,163.90x = 31,718 × 11,808.33
  4. Step 4: Simplify right side
    21,163.90x = 374,536,610.94
  5. Step 5: Solve for x
    x = 374,536,610.94/21,163.90
  6. Step 6: Final answer
    x = 17,696.96

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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.