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Finding the Fourth Proportional to 727.48, 1,091.36 and 356.91

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Solution

The fourth proportional to 727.48, 1,091.36 and 356.91 is: 535.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.48 : 1,091.36 = 356.91 : x
  2. Step 2: Convert to fraction form
    727.48/1,091.36 = 356.91/x
  3. Step 3: Cross multiply
    727.48x = 1,091.36 × 356.91
  4. Step 4: Simplify right side
    727.48x = 389,517.30
  5. Step 5: Solve for x
    x = 389,517.30/727.48
  6. Step 6: Final answer
    x = 535.43

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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.