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Finding the Fourth Proportional to 303.75, 418.88 and 198.80

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Solution

The fourth proportional to 303.75, 418.88 and 198.80 is: 274.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    303.75 : 418.88 = 198.80 : x
  2. Step 2: Convert to fraction form
    303.75/418.88 = 198.80/x
  3. Step 3: Cross multiply
    303.75x = 418.88 × 198.80
  4. Step 4: Simplify right side
    303.75x = 83,272.35
  5. Step 5: Solve for x
    x = 83,272.35/303.75
  6. Step 6: Final answer
    x = 274.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.