Home / 2,085.20-3,120.60-1,912.40

Finding the Fourth Proportional to 2,085.20, 3,120.60 and 1,912.40

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Solution

The fourth proportional to 2,085.20, 3,120.60 and 1,912.40 is: 2,862.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,085.20 : 3,120.60 = 1,912.40 : x
  2. Step 2: Convert to fraction form
    2,085.20/3,120.60 = 1,912.40/x
  3. Step 3: Cross multiply
    2,085.20x = 3,120.60 × 1,912.40
  4. Step 4: Simplify right side
    2,085.20x = 5,967,835.44
  5. Step 5: Solve for x
    x = 5,967,835.44/2,085.20
  6. Step 6: Final answer
    x = 2,862.00

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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.