Home / 2,811.21-3,878.19-1,631.60

Finding the Fourth Proportional to 2,811.21, 3,878.19 and 1,631.60

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Solution

The fourth proportional to 2,811.21, 3,878.19 and 1,631.60 is: 2,250.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.21 : 3,878.19 = 1,631.60 : x
  2. Step 2: Convert to fraction form
    2,811.21/3,878.19 = 1,631.60/x
  3. Step 3: Cross multiply
    2,811.21x = 3,878.19 × 1,631.60
  4. Step 4: Simplify right side
    2,811.21x = 6,327,663.16
  5. Step 5: Solve for x
    x = 6,327,663.16/2,811.21
  6. Step 6: Final answer
    x = 2,250.86

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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.