Home / 20,811.92-28,721.04-11,380.64

Finding the Fourth Proportional to 20,811.92, 28,721.04 and 11,380.64

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Solution

The fourth proportional to 20,811.92, 28,721.04 and 11,380.64 is: 15,705.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.92 : 28,721.04 = 11,380.64 : x
  2. Step 2: Convert to fraction form
    20,811.92/28,721.04 = 11,380.64/x
  3. Step 3: Cross multiply
    20,811.92x = 28,721.04 × 11,380.64
  4. Step 4: Simplify right side
    20,811.92x = 326,863,816.67
  5. Step 5: Solve for x
    x = 326,863,816.67/20,811.92
  6. Step 6: Final answer
    x = 15,705.61

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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.