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Finding the Fourth Proportional to 20,879.33, 31,314.74 and 6,839.78

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Solution

The fourth proportional to 20,879.33, 31,314.74 and 6,839.78 is: 10,258.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,879.33 : 31,314.74 = 6,839.78 : x
  2. Step 2: Convert to fraction form
    20,879.33/31,314.74 = 6,839.78/x
  3. Step 3: Cross multiply
    20,879.33x = 31,314.74 × 6,839.78
  4. Step 4: Simplify right side
    20,879.33x = 214,185,741.58
  5. Step 5: Solve for x
    x = 214,185,741.58/20,879.33
  6. Step 6: Final answer
    x = 10,258.27

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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.