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Finding the Fourth Proportional to 727.11, 1,090.39 and 361.70

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Solution

The fourth proportional to 727.11, 1,090.39 and 361.70 is: 542.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.11 : 1,090.39 = 361.70 : x
  2. Step 2: Convert to fraction form
    727.11/1,090.39 = 361.70/x
  3. Step 3: Cross multiply
    727.11x = 1,090.39 × 361.70
  4. Step 4: Simplify right side
    727.11x = 394,394.06
  5. Step 5: Solve for x
    x = 394,394.06/727.11
  6. Step 6: Final answer
    x = 542.41

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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.