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Finding the Fourth Proportional to 627.45, 939.41 and 318.63

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Solution

The fourth proportional to 627.45, 939.41 and 318.63 is: 477.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.45 : 939.41 = 318.63 : x
  2. Step 2: Convert to fraction form
    627.45/939.41 = 318.63/x
  3. Step 3: Cross multiply
    627.45x = 939.41 × 318.63
  4. Step 4: Simplify right side
    627.45x = 299,324.21
  5. Step 5: Solve for x
    x = 299,324.21/627.45
  6. Step 6: Final answer
    x = 477.05

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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.