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Finding the Fourth Proportional to 603.90, 905.17 and 398.61

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Solution

The fourth proportional to 603.90, 905.17 and 398.61 is: 597.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.90 : 905.17 = 398.61 : x
  2. Step 2: Convert to fraction form
    603.90/905.17 = 398.61/x
  3. Step 3: Cross multiply
    603.90x = 905.17 × 398.61
  4. Step 4: Simplify right side
    603.90x = 360,804.29
  5. Step 5: Solve for x
    x = 360,804.29/603.90
  6. Step 6: Final answer
    x = 597.46

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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.