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Finding the Fourth Proportional to 626.85, 939.60 and 318.78

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Solution

The fourth proportional to 626.85, 939.60 and 318.78 is: 477.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.85 : 939.60 = 318.78 : x
  2. Step 2: Convert to fraction form
    626.85/939.60 = 318.78/x
  3. Step 3: Cross multiply
    626.85x = 939.60 × 318.78
  4. Step 4: Simplify right side
    626.85x = 299,525.69
  5. Step 5: Solve for x
    x = 299,525.69/626.85
  6. Step 6: Final answer
    x = 477.83

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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.