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Finding the Fourth Proportional to 243.56, 335.34 and 221.96

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Solution

The fourth proportional to 243.56, 335.34 and 221.96 is: 305.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.56 : 335.34 = 221.96 : x
  2. Step 2: Convert to fraction form
    243.56/335.34 = 221.96/x
  3. Step 3: Cross multiply
    243.56x = 335.34 × 221.96
  4. Step 4: Simplify right side
    243.56x = 74,432.07
  5. Step 5: Solve for x
    x = 74,432.07/243.56
  6. Step 6: Final answer
    x = 305.60

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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.