Home / 20,811.22-28,719.30-11,379.85

Finding the Fourth Proportional to 20,811.22, 28,719.30 and 11,379.85

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Solution

The fourth proportional to 20,811.22, 28,719.30 and 11,379.85 is: 15,704.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.22 : 28,719.30 = 11,379.85 : x
  2. Step 2: Convert to fraction form
    20,811.22/28,719.30 = 11,379.85/x
  3. Step 3: Cross multiply
    20,811.22x = 28,719.30 × 11,379.85
  4. Step 4: Simplify right side
    20,811.22x = 326,821,326.11
  5. Step 5: Solve for x
    x = 326,821,326.11/20,811.22
  6. Step 6: Final answer
    x = 15,704.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.