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Finding the Fourth Proportional to 305.30, 421.05 and 205.73

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Solution

The fourth proportional to 305.30, 421.05 and 205.73 is: 283.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.30 : 421.05 = 205.73 : x
  2. Step 2: Convert to fraction form
    305.30/421.05 = 205.73/x
  3. Step 3: Cross multiply
    305.30x = 421.05 × 205.73
  4. Step 4: Simplify right side
    305.30x = 86,622.62
  5. Step 5: Solve for x
    x = 86,622.62/305.30
  6. Step 6: Final answer
    x = 283.73

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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.