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Finding the Fourth Proportional to 1,161.06, 1,741.81 and 381

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Solution

The fourth proportional to 1,161.06, 1,741.81 and 381 is: 571.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.06 : 1,741.81 = 381 : x
  2. Step 2: Convert to fraction form
    1,161.06/1,741.81 = 381/x
  3. Step 3: Cross multiply
    1,161.06x = 1,741.81 × 381
  4. Step 4: Simplify right side
    1,161.06x = 663,628.66
  5. Step 5: Solve for x
    x = 663,628.66/1,161.06
  6. Step 6: Final answer
    x = 571.57

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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.