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Finding the Fourth Proportional to 371.19, 556.40 and 127.58

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Solution

The fourth proportional to 371.19, 556.40 and 127.58 is: 191.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.19 : 556.40 = 127.58 : x
  2. Step 2: Convert to fraction form
    371.19/556.40 = 127.58/x
  3. Step 3: Cross multiply
    371.19x = 556.40 × 127.58
  4. Step 4: Simplify right side
    371.19x = 70,987.22
  5. Step 5: Solve for x
    x = 70,987.22/371.19
  6. Step 6: Final answer
    x = 191.24

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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.