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Finding the Fourth Proportional to 20,431.48, 28,198.20 and 11,479.48

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Solution

The fourth proportional to 20,431.48, 28,198.20 and 11,479.48 is: 15,843.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,431.48 : 28,198.20 = 11,479.48 : x
  2. Step 2: Convert to fraction form
    20,431.48/28,198.20 = 11,479.48/x
  3. Step 3: Cross multiply
    20,431.48x = 28,198.20 × 11,479.48
  4. Step 4: Simplify right side
    20,431.48x = 323,700,672.94
  5. Step 5: Solve for x
    x = 323,700,672.94/20,431.48
  6. Step 6: Final answer
    x = 15,843.23

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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.