Home / 2,012.99-2,778.02-1,128.80

Finding the Fourth Proportional to 2,012.99, 2,778.02 and 1,128.80

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Solution

The fourth proportional to 2,012.99, 2,778.02 and 1,128.80 is: 1,557.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,012.99 : 2,778.02 = 1,128.80 : x
  2. Step 2: Convert to fraction form
    2,012.99/2,778.02 = 1,128.80/x
  3. Step 3: Cross multiply
    2,012.99x = 2,778.02 × 1,128.80
  4. Step 4: Simplify right side
    2,012.99x = 3,135,809.44
  5. Step 5: Solve for x
    x = 3,135,809.44/2,012.99
  6. Step 6: Final answer
    x = 1,557.78

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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.