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Finding the Fourth Proportional to 727.25, 1,091.26 and 398.43

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Solution

The fourth proportional to 727.25, 1,091.26 and 398.43 is: 597.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.25 : 1,091.26 = 398.43 : x
  2. Step 2: Convert to fraction form
    727.25/1,091.26 = 398.43/x
  3. Step 3: Cross multiply
    727.25x = 1,091.26 × 398.43
  4. Step 4: Simplify right side
    727.25x = 434,790.72
  5. Step 5: Solve for x
    x = 434,790.72/727.25
  6. Step 6: Final answer
    x = 597.86

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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.