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Finding the Fourth Proportional to 2,439, 3,365.82 and 1,391.28

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Solution

The fourth proportional to 2,439, 3,365.82 and 1,391.28 is: 1,919.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,439 : 3,365.82 = 1,391.28 : x
  2. Step 2: Convert to fraction form
    2,439/3,365.82 = 1,391.28/x
  3. Step 3: Cross multiply
    2,439x = 3,365.82 × 1,391.28
  4. Step 4: Simplify right side
    2,439x = 4,682,798.05
  5. Step 5: Solve for x
    x = 4,682,798.05/2,439
  6. Step 6: Final answer
    x = 1,919.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.