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Finding the Fourth Proportional to 746.82, 1,118.99 and 381.11

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Solution

The fourth proportional to 746.82, 1,118.99 and 381.11 is: 571.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    746.82 : 1,118.99 = 381.11 : x
  2. Step 2: Convert to fraction form
    746.82/1,118.99 = 381.11/x
  3. Step 3: Cross multiply
    746.82x = 1,118.99 × 381.11
  4. Step 4: Simplify right side
    746.82x = 426,453.64
  5. Step 5: Solve for x
    x = 426,453.64/746.82
  6. Step 6: Final answer
    x = 571.03

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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.