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Finding the Fourth Proportional to 20,874.29, 28,805.92 and 11,921.60

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Solution

The fourth proportional to 20,874.29, 28,805.92 and 11,921.60 is: 16,451.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,874.29 : 28,805.92 = 11,921.60 : x
  2. Step 2: Convert to fraction form
    20,874.29/28,805.92 = 11,921.60/x
  3. Step 3: Cross multiply
    20,874.29x = 28,805.92 × 11,921.60
  4. Step 4: Simplify right side
    20,874.29x = 343,412,698.08
  5. Step 5: Solve for x
    x = 343,412,698.08/20,874.29
  6. Step 6: Final answer
    x = 16,451.47

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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.