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Finding the Fourth Proportional to 727.89, 1,091.29 and 439.26

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Solution

The fourth proportional to 727.89, 1,091.29 and 439.26 is: 658.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.89 : 1,091.29 = 439.26 : x
  2. Step 2: Convert to fraction form
    727.89/1,091.29 = 439.26/x
  3. Step 3: Cross multiply
    727.89x = 1,091.29 × 439.26
  4. Step 4: Simplify right side
    727.89x = 479,360.05
  5. Step 5: Solve for x
    x = 479,360.05/727.89
  6. Step 6: Final answer
    x = 658.56

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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.