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Finding the Fourth Proportional to 371.21, 556.89 and 127.68

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Solution

The fourth proportional to 371.21, 556.89 and 127.68 is: 191.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.21 : 556.89 = 127.68 : x
  2. Step 2: Convert to fraction form
    371.21/556.89 = 127.68/x
  3. Step 3: Cross multiply
    371.21x = 556.89 × 127.68
  4. Step 4: Simplify right side
    371.21x = 71,103.08
  5. Step 5: Solve for x
    x = 71,103.08/371.21
  6. Step 6: Final answer
    x = 191.54

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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.