Home / 5,419.40-8,138.70-3,960.20

Finding the Fourth Proportional to 5,419.40, 8,138.70 and 3,960.20

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Solution

The fourth proportional to 5,419.40, 8,138.70 and 3,960.20 is: 5,947.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,419.40 : 8,138.70 = 3,960.20 : x
  2. Step 2: Convert to fraction form
    5,419.40/8,138.70 = 3,960.20/x
  3. Step 3: Cross multiply
    5,419.40x = 8,138.70 × 3,960.20
  4. Step 4: Simplify right side
    5,419.40x = 32,230,879.74
  5. Step 5: Solve for x
    x = 32,230,879.74/5,419.40
  6. Step 6: Final answer
    x = 5,947.32

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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.