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Finding the Fourth Proportional to 550.21, 824.78 and 318.89

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Solution

The fourth proportional to 550.21, 824.78 and 318.89 is: 478.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    550.21 : 824.78 = 318.89 : x
  2. Step 2: Convert to fraction form
    550.21/824.78 = 318.89/x
  3. Step 3: Cross multiply
    550.21x = 824.78 × 318.89
  4. Step 4: Simplify right side
    550.21x = 263,014.09
  5. Step 5: Solve for x
    x = 263,014.09/550.21
  6. Step 6: Final answer
    x = 478.02

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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.