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Finding the Fourth Proportional to 371.63, 556.82 and 128.02

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Solution

The fourth proportional to 371.63, 556.82 and 128.02 is: 191.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.63 : 556.82 = 128.02 : x
  2. Step 2: Convert to fraction form
    371.63/556.82 = 128.02/x
  3. Step 3: Cross multiply
    371.63x = 556.82 × 128.02
  4. Step 4: Simplify right side
    371.63x = 71,284.10
  5. Step 5: Solve for x
    x = 71,284.10/371.63
  6. Step 6: Final answer
    x = 191.81

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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.