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Finding the Fourth Proportional to 2,628.70, 3,939.70 and 1,396.70

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Solution

The fourth proportional to 2,628.70, 3,939.70 and 1,396.70 is: 2,093.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,628.70 : 3,939.70 = 1,396.70 : x
  2. Step 2: Convert to fraction form
    2,628.70/3,939.70 = 1,396.70/x
  3. Step 3: Cross multiply
    2,628.70x = 3,939.70 × 1,396.70
  4. Step 4: Simplify right side
    2,628.70x = 5,502,578.99
  5. Step 5: Solve for x
    x = 5,502,578.99/2,628.70
  6. Step 6: Final answer
    x = 2,093.27

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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.