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Finding the Fourth Proportional to 727.38, 1,091.34 and 380.70

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Solution

The fourth proportional to 727.38, 1,091.34 and 380.70 is: 571.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.38 : 1,091.34 = 380.70 : x
  2. Step 2: Convert to fraction form
    727.38/1,091.34 = 380.70/x
  3. Step 3: Cross multiply
    727.38x = 1,091.34 × 380.70
  4. Step 4: Simplify right side
    727.38x = 415,473.14
  5. Step 5: Solve for x
    x = 415,473.14/727.38
  6. Step 6: Final answer
    x = 571.19

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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.