Home / 2,811.36-3,879.02-1,631.72

Finding the Fourth Proportional to 2,811.36, 3,879.02 and 1,631.72

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Solution

The fourth proportional to 2,811.36, 3,879.02 and 1,631.72 is: 2,251.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.36 : 3,879.02 = 1,631.72 : x
  2. Step 2: Convert to fraction form
    2,811.36/3,879.02 = 1,631.72/x
  3. Step 3: Cross multiply
    2,811.36x = 3,879.02 × 1,631.72
  4. Step 4: Simplify right side
    2,811.36x = 6,329,474.51
  5. Step 5: Solve for x
    x = 6,329,474.51/2,811.36
  6. Step 6: Final answer
    x = 2,251.39

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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.