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Finding the Fourth Proportional to 1,201.45, 1,801.91 and 379.78

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Solution

The fourth proportional to 1,201.45, 1,801.91 and 379.78 is: 569.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.45 : 1,801.91 = 379.78 : x
  2. Step 2: Convert to fraction form
    1,201.45/1,801.91 = 379.78/x
  3. Step 3: Cross multiply
    1,201.45x = 1,801.91 × 379.78
  4. Step 4: Simplify right side
    1,201.45x = 684,329.38
  5. Step 5: Solve for x
    x = 684,329.38/1,201.45
  6. Step 6: Final answer
    x = 569.59

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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.