Home / 2,878.21-3,971.91-1,636.21

Finding the Fourth Proportional to 2,878.21, 3,971.91 and 1,636.21

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Solution

The fourth proportional to 2,878.21, 3,971.91 and 1,636.21 is: 2,257.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,878.21 : 3,971.91 = 1,636.21 : x
  2. Step 2: Convert to fraction form
    2,878.21/3,971.91 = 1,636.21/x
  3. Step 3: Cross multiply
    2,878.21x = 3,971.91 × 1,636.21
  4. Step 4: Simplify right side
    2,878.21x = 6,498,878.86
  5. Step 5: Solve for x
    x = 6,498,878.86/2,878.21
  6. Step 6: Final answer
    x = 2,257.96

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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.