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Finding the Fourth Proportional to 263.72, 394.80 and 198.99

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Solution

The fourth proportional to 263.72, 394.80 and 198.99 is: 297.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.72 : 394.80 = 198.99 : x
  2. Step 2: Convert to fraction form
    263.72/394.80 = 198.99/x
  3. Step 3: Cross multiply
    263.72x = 394.80 × 198.99
  4. Step 4: Simplify right side
    263.72x = 78,561.25
  5. Step 5: Solve for x
    x = 78,561.25/263.72
  6. Step 6: Final answer
    x = 297.90

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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.