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Finding the Fourth Proportional to 20,876.11, 28,811.03 and 11,924.95

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Solution

The fourth proportional to 20,876.11, 28,811.03 and 11,924.95 is: 16,457.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,876.11 : 28,811.03 = 11,924.95 : x
  2. Step 2: Convert to fraction form
    20,876.11/28,811.03 = 11,924.95/x
  3. Step 3: Cross multiply
    20,876.11x = 28,811.03 × 11,924.95
  4. Step 4: Simplify right side
    20,876.11x = 343,570,092.20
  5. Step 5: Solve for x
    x = 343,570,092.20/20,876.11
  6. Step 6: Final answer
    x = 16,457.57

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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.