Home / 2,120.87-3,181.11-1,298.72

Finding the Fourth Proportional to 2,120.87, 3,181.11 and 1,298.72

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Solution

The fourth proportional to 2,120.87, 3,181.11 and 1,298.72 is: 1,947.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.87 : 3,181.11 = 1,298.72 : x
  2. Step 2: Convert to fraction form
    2,120.87/3,181.11 = 1,298.72/x
  3. Step 3: Cross multiply
    2,120.87x = 3,181.11 × 1,298.72
  4. Step 4: Simplify right side
    2,120.87x = 4,131,374.26
  5. Step 5: Solve for x
    x = 4,131,374.26/2,120.87
  6. Step 6: Final answer
    x = 1,947.96

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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.