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Finding the Fourth Proportional to 193.81, 267.17 and 128.20

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Solution

The fourth proportional to 193.81, 267.17 and 128.20 is: 176.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.81 : 267.17 = 128.20 : x
  2. Step 2: Convert to fraction form
    193.81/267.17 = 128.20/x
  3. Step 3: Cross multiply
    193.81x = 267.17 × 128.20
  4. Step 4: Simplify right side
    193.81x = 34,249.22
  5. Step 5: Solve for x
    x = 34,249.22/193.81
  6. Step 6: Final answer
    x = 176.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.