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Finding the Fourth Proportional to 727.41, 1,091.39 and 439.05

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Solution

The fourth proportional to 727.41, 1,091.39 and 439.05 is: 658.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.41 : 1,091.39 = 439.05 : x
  2. Step 2: Convert to fraction form
    727.41/1,091.39 = 439.05/x
  3. Step 3: Cross multiply
    727.41x = 1,091.39 × 439.05
  4. Step 4: Simplify right side
    727.41x = 479,174.78
  5. Step 5: Solve for x
    x = 479,174.78/727.41
  6. Step 6: Final answer
    x = 658.74

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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.