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Finding the Fourth Proportional to 418.80, 627.96 and 199.35

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Solution

The fourth proportional to 418.80, 627.96 and 199.35 is: 298.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.80 : 627.96 = 199.35 : x
  2. Step 2: Convert to fraction form
    418.80/627.96 = 199.35/x
  3. Step 3: Cross multiply
    418.80x = 627.96 × 199.35
  4. Step 4: Simplify right side
    418.80x = 125,180.69
  5. Step 5: Solve for x
    x = 125,180.69/418.80
  6. Step 6: Final answer
    x = 298.91

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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.