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Finding the Fourth Proportional to 603.41, 905.18 and 439.38

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Solution

The fourth proportional to 603.41, 905.18 and 439.38 is: 659.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.41 : 905.18 = 439.38 : x
  2. Step 2: Convert to fraction form
    603.41/905.18 = 439.38/x
  3. Step 3: Cross multiply
    603.41x = 905.18 × 439.38
  4. Step 4: Simplify right side
    603.41x = 397,715.79
  5. Step 5: Solve for x
    x = 397,715.79/603.41
  6. Step 6: Final answer
    x = 659.12

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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.