Home / 5,431.87-8,149.43-3,121.75

Finding the Fourth Proportional to 5,431.87, 8,149.43 and 3,121.75

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Solution

The fourth proportional to 5,431.87, 8,149.43 and 3,121.75 is: 4,683.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,431.87 : 8,149.43 = 3,121.75 : x
  2. Step 2: Convert to fraction form
    5,431.87/8,149.43 = 3,121.75/x
  3. Step 3: Cross multiply
    5,431.87x = 8,149.43 × 3,121.75
  4. Step 4: Simplify right side
    5,431.87x = 25,440,483.10
  5. Step 5: Solve for x
    x = 25,440,483.10/5,431.87
  6. Step 6: Final answer
    x = 4,683.56

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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.