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Finding the Fourth Proportional to 627.28, 938.72 and 379.72

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Solution

The fourth proportional to 627.28, 938.72 and 379.72 is: 568.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.28 : 938.72 = 379.72 : x
  2. Step 2: Convert to fraction form
    627.28/938.72 = 379.72/x
  3. Step 3: Cross multiply
    627.28x = 938.72 × 379.72
  4. Step 4: Simplify right side
    627.28x = 356,450.76
  5. Step 5: Solve for x
    x = 356,450.76/627.28
  6. Step 6: Final answer
    x = 568.25

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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.