Home / 3,121.24-4,682.58-1,390

Finding the Fourth Proportional to 3,121.24, 4,682.58 and 1,390

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Solution

The fourth proportional to 3,121.24, 4,682.58 and 1,390 is: 2,085.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.24 : 4,682.58 = 1,390 : x
  2. Step 2: Convert to fraction form
    3,121.24/4,682.58 = 1,390/x
  3. Step 3: Cross multiply
    3,121.24x = 4,682.58 × 1,390
  4. Step 4: Simplify right side
    3,121.24x = 6,508,786.20
  5. Step 5: Solve for x
    x = 6,508,786.20/3,121.24
  6. Step 6: Final answer
    x = 2,085.32

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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.