Home / 20,811.89-28,720.46-11,380.48

Finding the Fourth Proportional to 20,811.89, 28,720.46 and 11,380.48

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Solution

The fourth proportional to 20,811.89, 28,720.46 and 11,380.48 is: 15,705.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.89 : 28,720.46 = 11,380.48 : x
  2. Step 2: Convert to fraction form
    20,811.89/28,720.46 = 11,380.48/x
  3. Step 3: Cross multiply
    20,811.89x = 28,720.46 × 11,380.48
  4. Step 4: Simplify right side
    20,811.89x = 326,852,620.62
  5. Step 5: Solve for x
    x = 326,852,620.62/20,811.89
  6. Step 6: Final answer
    x = 15,705.09

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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.