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Finding the Fourth Proportional to 727.24, 1,091.34 and 361.72

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Solution

The fourth proportional to 727.24, 1,091.34 and 361.72 is: 542.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.24 : 1,091.34 = 361.72 : x
  2. Step 2: Convert to fraction form
    727.24/1,091.34 = 361.72/x
  3. Step 3: Cross multiply
    727.24x = 1,091.34 × 361.72
  4. Step 4: Simplify right side
    727.24x = 394,759.50
  5. Step 5: Solve for x
    x = 394,759.50/727.24
  6. Step 6: Final answer
    x = 542.82

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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.