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Finding the Fourth Proportional to 118.66, 178.35 and 76.18

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Solution

The fourth proportional to 118.66, 178.35 and 76.18 is: 114.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.66 : 178.35 = 76.18 : x
  2. Step 2: Convert to fraction form
    118.66/178.35 = 76.18/x
  3. Step 3: Cross multiply
    118.66x = 178.35 × 76.18
  4. Step 4: Simplify right side
    118.66x = 13,586.70
  5. Step 5: Solve for x
    x = 13,586.70/118.66
  6. Step 6: Final answer
    x = 114.50

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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.