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Finding the Fourth Proportional to 627.35, 939.26 and 318.55

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Solution

The fourth proportional to 627.35, 939.26 and 318.55 is: 476.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.35 : 939.26 = 318.55 : x
  2. Step 2: Convert to fraction form
    627.35/939.26 = 318.55/x
  3. Step 3: Cross multiply
    627.35x = 939.26 × 318.55
  4. Step 4: Simplify right side
    627.35x = 299,197.33
  5. Step 5: Solve for x
    x = 299,197.33/627.35
  6. Step 6: Final answer
    x = 476.93

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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.