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Finding the Fourth Proportional to 727.81, 1,091.31 and 380.29

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Solution

The fourth proportional to 727.81, 1,091.31 and 380.29 is: 570.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.81 : 1,091.31 = 380.29 : x
  2. Step 2: Convert to fraction form
    727.81/1,091.31 = 380.29/x
  3. Step 3: Cross multiply
    727.81x = 1,091.31 × 380.29
  4. Step 4: Simplify right side
    727.81x = 415,014.28
  5. Step 5: Solve for x
    x = 415,014.28/727.81
  6. Step 6: Final answer
    x = 570.22

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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.