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Finding the Fourth Proportional to 1,201.03, 1,805.39 and 1,115.43

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Solution

The fourth proportional to 1,201.03, 1,805.39 and 1,115.43 is: 1,676.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.03 : 1,805.39 = 1,115.43 : x
  2. Step 2: Convert to fraction form
    1,201.03/1,805.39 = 1,115.43/x
  3. Step 3: Cross multiply
    1,201.03x = 1,805.39 × 1,115.43
  4. Step 4: Simplify right side
    1,201.03x = 2,013,775.74
  5. Step 5: Solve for x
    x = 2,013,775.74/1,201.03
  6. Step 6: Final answer
    x = 1,676.71

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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.