Home / 2,819.12-3,889.80-1,640.12

Finding the Fourth Proportional to 2,819.12, 3,889.80 and 1,640.12

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Solution

The fourth proportional to 2,819.12, 3,889.80 and 1,640.12 is: 2,263.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,819.12 : 3,889.80 = 1,640.12 : x
  2. Step 2: Convert to fraction form
    2,819.12/3,889.80 = 1,640.12/x
  3. Step 3: Cross multiply
    2,819.12x = 3,889.80 × 1,640.12
  4. Step 4: Simplify right side
    2,819.12x = 6,379,738.78
  5. Step 5: Solve for x
    x = 6,379,738.78/2,819.12
  6. Step 6: Final answer
    x = 2,263.02

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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.