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Finding the Fourth Proportional to 627.05, 940.68 and 318.78

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Solution

The fourth proportional to 627.05, 940.68 and 318.78 is: 478.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.05 : 940.68 = 318.78 : x
  2. Step 2: Convert to fraction form
    627.05/940.68 = 318.78/x
  3. Step 3: Cross multiply
    627.05x = 940.68 × 318.78
  4. Step 4: Simplify right side
    627.05x = 299,869.97
  5. Step 5: Solve for x
    x = 299,869.97/627.05
  6. Step 6: Final answer
    x = 478.22

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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.