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Finding the Fourth Proportional to 379.20, 525.49 and 371.90

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Solution

The fourth proportional to 379.20, 525.49 and 371.90 is: 515.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.20 : 525.49 = 371.90 : x
  2. Step 2: Convert to fraction form
    379.20/525.49 = 371.90/x
  3. Step 3: Cross multiply
    379.20x = 525.49 × 371.90
  4. Step 4: Simplify right side
    379.20x = 195,429.73
  5. Step 5: Solve for x
    x = 195,429.73/379.20
  6. Step 6: Final answer
    x = 515.37

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.