Home / 3,105.15-4,285.70-1,778.99

Finding the Fourth Proportional to 3,105.15, 4,285.70 and 1,778.99

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Solution

The fourth proportional to 3,105.15, 4,285.70 and 1,778.99 is: 2,455.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,105.15 : 4,285.70 = 1,778.99 : x
  2. Step 2: Convert to fraction form
    3,105.15/4,285.70 = 1,778.99/x
  3. Step 3: Cross multiply
    3,105.15x = 4,285.70 × 1,778.99
  4. Step 4: Simplify right side
    3,105.15x = 7,624,187.12
  5. Step 5: Solve for x
    x = 7,624,187.12/3,105.15
  6. Step 6: Final answer
    x = 2,455.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.