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Finding the Fourth Proportional to 3,299.56, 4,949.22 and 991

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Solution

The fourth proportional to 3,299.56, 4,949.22 and 991 is: 1,486.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,299.56 : 4,949.22 = 991 : x
  2. Step 2: Convert to fraction form
    3,299.56/4,949.22 = 991/x
  3. Step 3: Cross multiply
    3,299.56x = 4,949.22 × 991
  4. Step 4: Simplify right side
    3,299.56x = 4,904,677.02
  5. Step 5: Solve for x
    x = 4,904,677.02/3,299.56
  6. Step 6: Final answer
    x = 1,486.46

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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.