Home / 5,405.40-8,103.32-2,120.85

Finding the Fourth Proportional to 5,405.40, 8,103.32 and 2,120.85

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Solution

The fourth proportional to 5,405.40, 8,103.32 and 2,120.85 is: 3,179.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,405.40 : 8,103.32 = 2,120.85 : x
  2. Step 2: Convert to fraction form
    5,405.40/8,103.32 = 2,120.85/x
  3. Step 3: Cross multiply
    5,405.40x = 8,103.32 × 2,120.85
  4. Step 4: Simplify right side
    5,405.40x = 17,185,915.62
  5. Step 5: Solve for x
    x = 17,185,915.62/5,405.40
  6. Step 6: Final answer
    x = 3,179.40

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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.