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Finding the Fourth Proportional to 626.62, 939.86 and 193.78

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Solution

The fourth proportional to 626.62, 939.86 and 193.78 is: 290.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.62 : 939.86 = 193.78 : x
  2. Step 2: Convert to fraction form
    626.62/939.86 = 193.78/x
  3. Step 3: Cross multiply
    626.62x = 939.86 × 193.78
  4. Step 4: Simplify right side
    626.62x = 182,120.89
  5. Step 5: Solve for x
    x = 182,120.89/626.62
  6. Step 6: Final answer
    x = 290.64

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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.