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Finding the Fourth Proportional to 626.60, 939.90 and 193.80

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Solution

The fourth proportional to 626.60, 939.90 and 193.80 is: 290.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.60 : 939.90 = 193.80 : x
  2. Step 2: Convert to fraction form
    626.60/939.90 = 193.80/x
  3. Step 3: Cross multiply
    626.60x = 939.90 × 193.80
  4. Step 4: Simplify right side
    626.60x = 182,152.62
  5. Step 5: Solve for x
    x = 182,152.62/626.60
  6. Step 6: Final answer
    x = 290.70

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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.