Home / 2,120.70-3,193.19-1,991.10

Finding the Fourth Proportional to 2,120.70, 3,193.19 and 1,991.10

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Solution

The fourth proportional to 2,120.70, 3,193.19 and 1,991.10 is: 2,998.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.70 : 3,193.19 = 1,991.10 : x
  2. Step 2: Convert to fraction form
    2,120.70/3,193.19 = 1,991.10/x
  3. Step 3: Cross multiply
    2,120.70x = 3,193.19 × 1,991.10
  4. Step 4: Simplify right side
    2,120.70x = 6,357,950.65
  5. Step 5: Solve for x
    x = 6,357,950.65/2,120.70
  6. Step 6: Final answer
    x = 2,998.04

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.