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Finding the Fourth Proportional to 118.82, 178.14 and 84.38

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Solution

The fourth proportional to 118.82, 178.14 and 84.38 is: 126.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.82 : 178.14 = 84.38 : x
  2. Step 2: Convert to fraction form
    118.82/178.14 = 84.38/x
  3. Step 3: Cross multiply
    118.82x = 178.14 × 84.38
  4. Step 4: Simplify right side
    118.82x = 15,031.45
  5. Step 5: Solve for x
    x = 15,031.45/118.82
  6. Step 6: Final answer
    x = 126.51

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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.