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Finding the Fourth Proportional to 269.90, 405.15 and 196.89

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Solution

The fourth proportional to 269.90, 405.15 and 196.89 is: 295.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.90 : 405.15 = 196.89 : x
  2. Step 2: Convert to fraction form
    269.90/405.15 = 196.89/x
  3. Step 3: Cross multiply
    269.90x = 405.15 × 196.89
  4. Step 4: Simplify right side
    269.90x = 79,769.98
  5. Step 5: Solve for x
    x = 79,769.98/269.90
  6. Step 6: Final answer
    x = 295.55

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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.