Home / 20,821.42-31,228.86-6,781.96

Finding the Fourth Proportional to 20,821.42, 31,228.86 and 6,781.96

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Solution

The fourth proportional to 20,821.42, 31,228.86 and 6,781.96 is: 10,171.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.42 : 31,228.86 = 6,781.96 : x
  2. Step 2: Convert to fraction form
    20,821.42/31,228.86 = 6,781.96/x
  3. Step 3: Cross multiply
    20,821.42x = 31,228.86 × 6,781.96
  4. Step 4: Simplify right side
    20,821.42x = 211,792,879.37
  5. Step 5: Solve for x
    x = 211,792,879.37/20,821.42
  6. Step 6: Final answer
    x = 10,171.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.