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Finding the Fourth Proportional to 371.25, 556.71 and 127.80

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Solution

The fourth proportional to 371.25, 556.71 and 127.80 is: 191.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.25 : 556.71 = 127.80 : x
  2. Step 2: Convert to fraction form
    371.25/556.71 = 127.80/x
  3. Step 3: Cross multiply
    371.25x = 556.71 × 127.80
  4. Step 4: Simplify right side
    371.25x = 71,147.54
  5. Step 5: Solve for x
    x = 71,147.54/371.25
  6. Step 6: Final answer
    x = 191.64

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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.