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Finding the Fourth Proportional to 3,321.87, 4,982.80 and 856.69

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Solution

The fourth proportional to 3,321.87, 4,982.80 and 856.69 is: 1,285.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,321.87 : 4,982.80 = 856.69 : x
  2. Step 2: Convert to fraction form
    3,321.87/4,982.80 = 856.69/x
  3. Step 3: Cross multiply
    3,321.87x = 4,982.80 × 856.69
  4. Step 4: Simplify right side
    3,321.87x = 4,268,712.56
  5. Step 5: Solve for x
    x = 4,268,712.56/3,321.87
  6. Step 6: Final answer
    x = 1,285.03

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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.