Home / 21,231.27-31,860.78-8,083.77

Finding the Fourth Proportional to 21,231.27, 31,860.78 and 8,083.77

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Solution

The fourth proportional to 21,231.27, 31,860.78 and 8,083.77 is: 12,130.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,231.27 : 31,860.78 = 8,083.77 : x
  2. Step 2: Convert to fraction form
    21,231.27/31,860.78 = 8,083.77/x
  3. Step 3: Cross multiply
    21,231.27x = 31,860.78 × 8,083.77
  4. Step 4: Simplify right side
    21,231.27x = 257,555,217.54
  5. Step 5: Solve for x
    x = 257,555,217.54/21,231.27
  6. Step 6: Final answer
    x = 12,130.94

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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.