Home / 5,405.21-8,109.77-2,120.54

Finding the Fourth Proportional to 5,405.21, 8,109.77 and 2,120.54

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Solution

The fourth proportional to 5,405.21, 8,109.77 and 2,120.54 is: 3,181.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,405.21 : 8,109.77 = 2,120.54 : x
  2. Step 2: Convert to fraction form
    5,405.21/8,109.77 = 2,120.54/x
  3. Step 3: Cross multiply
    5,405.21x = 8,109.77 × 2,120.54
  4. Step 4: Simplify right side
    5,405.21x = 17,197,101.35
  5. Step 5: Solve for x
    x = 17,197,101.35/5,405.21
  6. Step 6: Final answer
    x = 3,181.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.