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Finding the Fourth Proportional to 603.88, 905.20 and 278.92

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Solution

The fourth proportional to 603.88, 905.20 and 278.92 is: 418.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.88 : 905.20 = 278.92 : x
  2. Step 2: Convert to fraction form
    603.88/905.20 = 278.92/x
  3. Step 3: Cross multiply
    603.88x = 905.20 × 278.92
  4. Step 4: Simplify right side
    603.88x = 252,478.38
  5. Step 5: Solve for x
    x = 252,478.38/603.88
  6. Step 6: Final answer
    x = 418.09

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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.