Home / 2,122.42-3,179.49-1,389.77

Finding the Fourth Proportional to 2,122.42, 3,179.49 and 1,389.77

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Solution

The fourth proportional to 2,122.42, 3,179.49 and 1,389.77 is: 2,081.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,122.42 : 3,179.49 = 1,389.77 : x
  2. Step 2: Convert to fraction form
    2,122.42/3,179.49 = 1,389.77/x
  3. Step 3: Cross multiply
    2,122.42x = 3,179.49 × 1,389.77
  4. Step 4: Simplify right side
    2,122.42x = 4,418,767.77
  5. Step 5: Solve for x
    x = 4,418,767.77/2,122.42
  6. Step 6: Final answer
    x = 2,081.95

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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.