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Finding the Fourth Proportional to 118.85, 178.38 and 84.51

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Solution

The fourth proportional to 118.85, 178.38 and 84.51 is: 126.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.85 : 178.38 = 84.51 : x
  2. Step 2: Convert to fraction form
    118.85/178.38 = 84.51/x
  3. Step 3: Cross multiply
    118.85x = 178.38 × 84.51
  4. Step 4: Simplify right side
    118.85x = 15,074.89
  5. Step 5: Solve for x
    x = 15,074.89/118.85
  6. Step 6: Final answer
    x = 126.84

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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.