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Finding the Fourth Proportional to 604.15, 906.20 and 219.40

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Solution

The fourth proportional to 604.15, 906.20 and 219.40 is: 329.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    604.15 : 906.20 = 219.40 : x
  2. Step 2: Convert to fraction form
    604.15/906.20 = 219.40/x
  3. Step 3: Cross multiply
    604.15x = 906.20 × 219.40
  4. Step 4: Simplify right side
    604.15x = 198,817.74
  5. Step 5: Solve for x
    x = 198,817.74/604.15
  6. Step 6: Final answer
    x = 329.09

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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.