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Finding the Fourth Proportional to 20,456.94, 28,229.94 and 11,504.82

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Solution

The fourth proportional to 20,456.94, 28,229.94 and 11,504.82 is: 15,876.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,456.94 : 28,229.94 = 11,504.82 : x
  2. Step 2: Convert to fraction form
    20,456.94/28,229.94 = 11,504.82/x
  3. Step 3: Cross multiply
    20,456.94x = 28,229.94 × 11,504.82
  4. Step 4: Simplify right side
    20,456.94x = 324,780,378.31
  5. Step 5: Solve for x
    x = 324,780,378.31/20,456.94
  6. Step 6: Final answer
    x = 15,876.29

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1.5x scale

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.