Home / 5,639.94-7,782.99-3,121.90

Finding the Fourth Proportional to 5,639.94, 7,782.99 and 3,121.90

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Solution

The fourth proportional to 5,639.94, 7,782.99 and 3,121.90 is: 4,308.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,639.94 : 7,782.99 = 3,121.90 : x
  2. Step 2: Convert to fraction form
    5,639.94/7,782.99 = 3,121.90/x
  3. Step 3: Cross multiply
    5,639.94x = 7,782.99 × 3,121.90
  4. Step 4: Simplify right side
    5,639.94x = 24,297,716.48
  5. Step 5: Solve for x
    x = 24,297,716.48/5,639.94
  6. Step 6: Final answer
    x = 4,308.15

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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.