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Finding the Fourth Proportional to 3,939.80, 5,910.78 and 3,120.80

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Solution

The fourth proportional to 3,939.80, 5,910.78 and 3,120.80 is: 4,682.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,939.80 : 5,910.78 = 3,120.80 : x
  2. Step 2: Convert to fraction form
    3,939.80/5,910.78 = 3,120.80/x
  3. Step 3: Cross multiply
    3,939.80x = 5,910.78 × 3,120.80
  4. Step 4: Simplify right side
    3,939.80x = 18,446,362.22
  5. Step 5: Solve for x
    x = 18,446,362.22/3,939.80
  6. Step 6: Final answer
    x = 4,682.06

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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.