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Finding the Fourth Proportional to 305.73, 421.89 and 218.55

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Solution

The fourth proportional to 305.73, 421.89 and 218.55 is: 301.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.73 : 421.89 = 218.55 : x
  2. Step 2: Convert to fraction form
    305.73/421.89 = 218.55/x
  3. Step 3: Cross multiply
    305.73x = 421.89 × 218.55
  4. Step 4: Simplify right side
    305.73x = 92,204.06
  5. Step 5: Solve for x
    x = 92,204.06/305.73
  6. Step 6: Final answer
    x = 301.59

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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.