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Finding the Fourth Proportional to 379.80, 524.07 and 211.73

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Solution

The fourth proportional to 379.80, 524.07 and 211.73 is: 292.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.80 : 524.07 = 211.73 : x
  2. Step 2: Convert to fraction form
    379.80/524.07 = 211.73/x
  3. Step 3: Cross multiply
    379.80x = 524.07 × 211.73
  4. Step 4: Simplify right side
    379.80x = 110,958.72
  5. Step 5: Solve for x
    x = 110,958.72/379.80
  6. Step 6: Final answer
    x = 292.15

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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.