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Finding the Fourth Proportional to 627.72, 939.86 and 453.88

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Solution

The fourth proportional to 627.72, 939.86 and 453.88 is: 679.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.72 : 939.86 = 453.88 : x
  2. Step 2: Convert to fraction form
    627.72/939.86 = 453.88/x
  3. Step 3: Cross multiply
    627.72x = 939.86 × 453.88
  4. Step 4: Simplify right side
    627.72x = 426,583.66
  5. Step 5: Solve for x
    x = 426,583.66/627.72
  6. Step 6: Final answer
    x = 679.58

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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.