Home / 20,811.72-28,716.44-12,309.61

Finding the Fourth Proportional to 20,811.72, 28,716.44 and 12,309.61

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Solution

The fourth proportional to 20,811.72, 28,716.44 and 12,309.61 is: 16,985.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.72 : 28,716.44 = 12,309.61 : x
  2. Step 2: Convert to fraction form
    20,811.72/28,716.44 = 12,309.61/x
  3. Step 3: Cross multiply
    20,811.72x = 28,716.44 × 12,309.61
  4. Step 4: Simplify right side
    20,811.72x = 353,488,176.99
  5. Step 5: Solve for x
    x = 353,488,176.99/20,811.72
  6. Step 6: Final answer
    x = 16,985.05

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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.