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Finding the Fourth Proportional to 627.20, 939.45 and 384.20

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Solution

The fourth proportional to 627.20, 939.45 and 384.20 is: 575.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.20 : 939.45 = 384.20 : x
  2. Step 2: Convert to fraction form
    627.20/939.45 = 384.20/x
  3. Step 3: Cross multiply
    627.20x = 939.45 × 384.20
  4. Step 4: Simplify right side
    627.20x = 360,936.69
  5. Step 5: Solve for x
    x = 360,936.69/627.20
  6. Step 6: Final answer
    x = 575.47

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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.