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Finding the Fourth Proportional to 603.96, 905.42 and 279.12

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Solution

The fourth proportional to 603.96, 905.42 and 279.12 is: 418.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.96 : 905.42 = 279.12 : x
  2. Step 2: Convert to fraction form
    603.96/905.42 = 279.12/x
  3. Step 3: Cross multiply
    603.96x = 905.42 × 279.12
  4. Step 4: Simplify right side
    603.96x = 252,720.83
  5. Step 5: Solve for x
    x = 252,720.83/603.96
  6. Step 6: Final answer
    x = 418.44

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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.