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Finding the Fourth Proportional to 2,991.38, 4,487.78 and 939.38

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Solution

The fourth proportional to 2,991.38, 4,487.78 and 939.38 is: 1,409.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,991.38 : 4,487.78 = 939.38 : x
  2. Step 2: Convert to fraction form
    2,991.38/4,487.78 = 939.38/x
  3. Step 3: Cross multiply
    2,991.38x = 4,487.78 × 939.38
  4. Step 4: Simplify right side
    2,991.38x = 4,215,730.78
  5. Step 5: Solve for x
    x = 4,215,730.78/2,991.38
  6. Step 6: Final answer
    x = 1,409.29

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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.