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Finding the Fourth Proportional to 303.72, 418.89 and 198.70

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Solution

The fourth proportional to 303.72, 418.89 and 198.70 is: 274.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    303.72 : 418.89 = 198.70 : x
  2. Step 2: Convert to fraction form
    303.72/418.89 = 198.70/x
  3. Step 3: Cross multiply
    303.72x = 418.89 × 198.70
  4. Step 4: Simplify right side
    303.72x = 83,233.44
  5. Step 5: Solve for x
    x = 83,233.44/303.72
  6. Step 6: Final answer
    x = 274.05

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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.