Home / 2,121.18-3,176.33-1,388.62

Finding the Fourth Proportional to 2,121.18, 3,176.33 and 1,388.62

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Solution

The fourth proportional to 2,121.18, 3,176.33 and 1,388.62 is: 2,079.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.18 : 3,176.33 = 1,388.62 : x
  2. Step 2: Convert to fraction form
    2,121.18/3,176.33 = 1,388.62/x
  3. Step 3: Cross multiply
    2,121.18x = 3,176.33 × 1,388.62
  4. Step 4: Simplify right side
    2,121.18x = 4,410,715.36
  5. Step 5: Solve for x
    x = 4,410,715.36/2,121.18
  6. Step 6: Final answer
    x = 2,079.37

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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.