Home / 20,731.20-28,609.82-11,780.21

Finding the Fourth Proportional to 20,731.20, 28,609.82 and 11,780.21

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Solution

The fourth proportional to 20,731.20, 28,609.82 and 11,780.21 is: 16,257.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,731.20 : 28,609.82 = 11,780.21 : x
  2. Step 2: Convert to fraction form
    20,731.20/28,609.82 = 11,780.21/x
  3. Step 3: Cross multiply
    20,731.20x = 28,609.82 × 11,780.21
  4. Step 4: Simplify right side
    20,731.20x = 337,029,687.66
  5. Step 5: Solve for x
    x = 337,029,687.66/20,731.20
  6. Step 6: Final answer
    x = 16,257.12

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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.