Home / 20,811.96-28,720.32-11,380.56

Finding the Fourth Proportional to 20,811.96, 28,720.32 and 11,380.56

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Solution

The fourth proportional to 20,811.96, 28,720.32 and 11,380.56 is: 15,705.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.96 : 28,720.32 = 11,380.56 : x
  2. Step 2: Convert to fraction form
    20,811.96/28,720.32 = 11,380.56/x
  3. Step 3: Cross multiply
    20,811.96x = 28,720.32 × 11,380.56
  4. Step 4: Simplify right side
    20,811.96x = 326,853,324.98
  5. Step 5: Solve for x
    x = 326,853,324.98/20,811.96
  6. Step 6: Final answer
    x = 15,705.07

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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.