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Finding the Fourth Proportional to 603.28, 905.28 and 218.52

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Solution

The fourth proportional to 603.28, 905.28 and 218.52 is: 327.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.28 : 905.28 = 218.52 : x
  2. Step 2: Convert to fraction form
    603.28/905.28 = 218.52/x
  3. Step 3: Cross multiply
    603.28x = 905.28 × 218.52
  4. Step 4: Simplify right side
    603.28x = 197,821.79
  5. Step 5: Solve for x
    x = 197,821.79/603.28
  6. Step 6: Final answer
    x = 327.91

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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.