Home / 20,731.26-28,609.20-11,778.78

Finding the Fourth Proportional to 20,731.26, 28,609.20 and 11,778.78

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Solution

The fourth proportional to 20,731.26, 28,609.20 and 11,778.78 is: 16,254.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,731.26 : 28,609.20 = 11,778.78 : x
  2. Step 2: Convert to fraction form
    20,731.26/28,609.20 = 11,778.78/x
  3. Step 3: Cross multiply
    20,731.26x = 28,609.20 × 11,778.78
  4. Step 4: Simplify right side
    20,731.26x = 336,981,472.78
  5. Step 5: Solve for x
    x = 336,981,472.78/20,731.26
  6. Step 6: Final answer
    x = 16,254.75

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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.