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Finding the Fourth Proportional to 604.86, 905.75 and 398.81

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Solution

The fourth proportional to 604.86, 905.75 and 398.81 is: 597.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    604.86 : 905.75 = 398.81 : x
  2. Step 2: Convert to fraction form
    604.86/905.75 = 398.81/x
  3. Step 3: Cross multiply
    604.86x = 905.75 × 398.81
  4. Step 4: Simplify right side
    604.86x = 361,215.63
  5. Step 5: Solve for x
    x = 361,215.63/604.86
  6. Step 6: Final answer
    x = 597.19

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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.