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Finding the Fourth Proportional to 3,979.48, 5,971.20 and 1,789

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Solution

The fourth proportional to 3,979.48, 5,971.20 and 1,789 is: 2,684.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979.48 : 5,971.20 = 1,789 : x
  2. Step 2: Convert to fraction form
    3,979.48/5,971.20 = 1,789/x
  3. Step 3: Cross multiply
    3,979.48x = 5,971.20 × 1,789
  4. Step 4: Simplify right side
    3,979.48x = 10,682,476.80
  5. Step 5: Solve for x
    x = 10,682,476.80/3,979.48
  6. Step 6: Final answer
    x = 2,684.39

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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.