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Finding the Fourth Proportional to 20,876.54, 28,809.02 and 11,923.85

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Solution

The fourth proportional to 20,876.54, 28,809.02 and 11,923.85 is: 16,454.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,876.54 : 28,809.02 = 11,923.85 : x
  2. Step 2: Convert to fraction form
    20,876.54/28,809.02 = 11,923.85/x
  3. Step 3: Cross multiply
    20,876.54x = 28,809.02 × 11,923.85
  4. Step 4: Simplify right side
    20,876.54x = 343,514,534.96
  5. Step 5: Solve for x
    x = 343,514,534.96/20,876.54
  6. Step 6: Final answer
    x = 16,454.58

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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.