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Finding the Fourth Proportional to 3,299.86, 4,949.80 and 991.36

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Solution

The fourth proportional to 3,299.86, 4,949.80 and 991.36 is: 1,487.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,299.86 : 4,949.80 = 991.36 : x
  2. Step 2: Convert to fraction form
    3,299.86/4,949.80 = 991.36/x
  3. Step 3: Cross multiply
    3,299.86x = 4,949.80 × 991.36
  4. Step 4: Simplify right side
    3,299.86x = 4,907,043.62
  5. Step 5: Solve for x
    x = 4,907,043.62/3,299.86
  6. Step 6: Final answer
    x = 1,487.04

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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.