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Finding the Fourth Proportional to 627.12, 939.87 and 319.05

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Solution

The fourth proportional to 627.12, 939.87 and 319.05 is: 478.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.12 : 939.87 = 319.05 : x
  2. Step 2: Convert to fraction form
    627.12/939.87 = 319.05/x
  3. Step 3: Cross multiply
    627.12x = 939.87 × 319.05
  4. Step 4: Simplify right side
    627.12x = 299,865.52
  5. Step 5: Solve for x
    x = 299,865.52/627.12
  6. Step 6: Final answer
    x = 478.16

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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.