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Finding the Fourth Proportional to 604.20, 906.42 and 219.45

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Solution

The fourth proportional to 604.20, 906.42 and 219.45 is: 329.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    604.20 : 906.42 = 219.45 : x
  2. Step 2: Convert to fraction form
    604.20/906.42 = 219.45/x
  3. Step 3: Cross multiply
    604.20x = 906.42 × 219.45
  4. Step 4: Simplify right side
    604.20x = 198,913.87
  5. Step 5: Solve for x
    x = 198,913.87/604.20
  6. Step 6: Final answer
    x = 329.22

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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.