Home / 3,121.16-4,682.30-1,389.80

Finding the Fourth Proportional to 3,121.16, 4,682.30 and 1,389.80

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Solution

The fourth proportional to 3,121.16, 4,682.30 and 1,389.80 is: 2,084.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.16 : 4,682.30 = 1,389.80 : x
  2. Step 2: Convert to fraction form
    3,121.16/4,682.30 = 1,389.80/x
  3. Step 3: Cross multiply
    3,121.16x = 4,682.30 × 1,389.80
  4. Step 4: Simplify right side
    3,121.16x = 6,507,460.54
  5. Step 5: Solve for x
    x = 6,507,460.54/3,121.16
  6. Step 6: Final answer
    x = 2,084.95

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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.