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Finding the Fourth Proportional to 20,809.97, 28,717.72 and 11,249.87

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Solution

The fourth proportional to 20,809.97, 28,717.72 and 11,249.87 is: 15,524.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,809.97 : 28,717.72 = 11,249.87 : x
  2. Step 2: Convert to fraction form
    20,809.97/28,717.72 = 11,249.87/x
  3. Step 3: Cross multiply
    20,809.97x = 28,717.72 × 11,249.87
  4. Step 4: Simplify right side
    20,809.97x = 323,070,508.26
  5. Step 5: Solve for x
    x = 323,070,508.26/20,809.97
  6. Step 6: Final answer
    x = 15,524.79

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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.