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Finding the Fourth Proportional to 626.81, 939.87 and 318.60

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Solution

The fourth proportional to 626.81, 939.87 and 318.60 is: 477.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.81 : 939.87 = 318.60 : x
  2. Step 2: Convert to fraction form
    626.81/939.87 = 318.60/x
  3. Step 3: Cross multiply
    626.81x = 939.87 × 318.60
  4. Step 4: Simplify right side
    626.81x = 299,442.58
  5. Step 5: Solve for x
    x = 299,442.58/626.81
  6. Step 6: Final answer
    x = 477.73

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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.