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Finding the Fourth Proportional to 603.85, 905.91 and 219.10

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Solution

The fourth proportional to 603.85, 905.91 and 219.10 is: 328.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.85 : 905.91 = 219.10 : x
  2. Step 2: Convert to fraction form
    603.85/905.91 = 219.10/x
  3. Step 3: Cross multiply
    603.85x = 905.91 × 219.10
  4. Step 4: Simplify right side
    603.85x = 198,484.88
  5. Step 5: Solve for x
    x = 198,484.88/603.85
  6. Step 6: Final answer
    x = 328.70

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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.