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Finding the Fourth Proportional to 996.11, 1,490.90 and 550.70

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Solution

The fourth proportional to 996.11, 1,490.90 and 550.70 is: 824.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.11 : 1,490.90 = 550.70 : x
  2. Step 2: Convert to fraction form
    996.11/1,490.90 = 550.70/x
  3. Step 3: Cross multiply
    996.11x = 1,490.90 × 550.70
  4. Step 4: Simplify right side
    996.11x = 821,028.42
  5. Step 5: Solve for x
    x = 821,028.42/996.11
  6. Step 6: Final answer
    x = 824.24

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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.