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Finding the Fourth Proportional to 442.80, 663.46 and 198.79

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Solution

The fourth proportional to 442.80, 663.46 and 198.79 is: 297.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.80 : 663.46 = 198.79 : x
  2. Step 2: Convert to fraction form
    442.80/663.46 = 198.79/x
  3. Step 3: Cross multiply
    442.80x = 663.46 × 198.79
  4. Step 4: Simplify right side
    442.80x = 131,887.06
  5. Step 5: Solve for x
    x = 131,887.06/442.80
  6. Step 6: Final answer
    x = 297.85

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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.