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Finding the Fourth Proportional to 194.15, 267.81 and 128.63

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Solution

The fourth proportional to 194.15, 267.81 and 128.63 is: 177.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.15 : 267.81 = 128.63 : x
  2. Step 2: Convert to fraction form
    194.15/267.81 = 128.63/x
  3. Step 3: Cross multiply
    194.15x = 267.81 × 128.63
  4. Step 4: Simplify right side
    194.15x = 34,448.40
  5. Step 5: Solve for x
    x = 34,448.40/194.15
  6. Step 6: Final answer
    x = 177.43

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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.