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Finding the Fourth Proportional to 1,201.11, 1,801.61 and 379.43

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Solution

The fourth proportional to 1,201.11, 1,801.61 and 379.43 is: 569.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.11 : 1,801.61 = 379.43 : x
  2. Step 2: Convert to fraction form
    1,201.11/1,801.61 = 379.43/x
  3. Step 3: Cross multiply
    1,201.11x = 1,801.61 × 379.43
  4. Step 4: Simplify right side
    1,201.11x = 683,584.88
  5. Step 5: Solve for x
    x = 683,584.88/1,201.11
  6. Step 6: Final answer
    x = 569.13

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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.