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Finding the Fourth Proportional to 550.60, 824.10 and 428.20

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Solution

The fourth proportional to 550.60, 824.10 and 428.20 is: 640.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    550.60 : 824.10 = 428.20 : x
  2. Step 2: Convert to fraction form
    550.60/824.10 = 428.20/x
  3. Step 3: Cross multiply
    550.60x = 824.10 × 428.20
  4. Step 4: Simplify right side
    550.60x = 352,879.62
  5. Step 5: Solve for x
    x = 352,879.62/550.60
  6. Step 6: Final answer
    x = 640.90

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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.