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Finding the Fourth Proportional to 118.75, 178.25 and 84.58

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Solution

The fourth proportional to 118.75, 178.25 and 84.58 is: 126.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.75 : 178.25 = 84.58 : x
  2. Step 2: Convert to fraction form
    118.75/178.25 = 84.58/x
  3. Step 3: Cross multiply
    118.75x = 178.25 × 84.58
  4. Step 4: Simplify right side
    118.75x = 15,075.99
  5. Step 5: Solve for x
    x = 15,075.99/118.75
  6. Step 6: Final answer
    x = 126.96

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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.