Home / 2,105.80-3,158.70-1,328.20

Finding the Fourth Proportional to 2,105.80, 3,158.70 and 1,328.20

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Solution

The fourth proportional to 2,105.80, 3,158.70 and 1,328.20 is: 1,992.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,105.80 : 3,158.70 = 1,328.20 : x
  2. Step 2: Convert to fraction form
    2,105.80/3,158.70 = 1,328.20/x
  3. Step 3: Cross multiply
    2,105.80x = 3,158.70 × 1,328.20
  4. Step 4: Simplify right side
    2,105.80x = 4,195,385.34
  5. Step 5: Solve for x
    x = 4,195,385.34/2,105.80
  6. Step 6: Final answer
    x = 1,992.30

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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.