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Finding the Fourth Proportional to 3,321.23, 4,981.83 and 855.84

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Solution

The fourth proportional to 3,321.23, 4,981.83 and 855.84 is: 1,283.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,321.23 : 4,981.83 = 855.84 : x
  2. Step 2: Convert to fraction form
    3,321.23/4,981.83 = 855.84/x
  3. Step 3: Cross multiply
    3,321.23x = 4,981.83 × 855.84
  4. Step 4: Simplify right side
    3,321.23x = 4,263,649.39
  5. Step 5: Solve for x
    x = 4,263,649.39/3,321.23
  6. Step 6: Final answer
    x = 1,283.76

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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.