Home / 20,811.72-28,719.99-11,380.35

Finding the Fourth Proportional to 20,811.72, 28,719.99 and 11,380.35

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Solution

The fourth proportional to 20,811.72, 28,719.99 and 11,380.35 is: 15,704.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.72 : 28,719.99 = 11,380.35 : x
  2. Step 2: Convert to fraction form
    20,811.72/28,719.99 = 11,380.35/x
  3. Step 3: Cross multiply
    20,811.72x = 28,719.99 × 11,380.35
  4. Step 4: Simplify right side
    20,811.72x = 326,843,538.20
  5. Step 5: Solve for x
    x = 326,843,538.20/20,811.72
  6. Step 6: Final answer
    x = 15,704.78

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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.