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Finding the Fourth Proportional to 220.79, 331.55 and 211.05

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Solution

The fourth proportional to 220.79, 331.55 and 211.05 is: 316.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.79 : 331.55 = 211.05 : x
  2. Step 2: Convert to fraction form
    220.79/331.55 = 211.05/x
  3. Step 3: Cross multiply
    220.79x = 331.55 × 211.05
  4. Step 4: Simplify right side
    220.79x = 69,972.57
  5. Step 5: Solve for x
    x = 69,972.57/220.79
  6. Step 6: Final answer
    x = 316.93

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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.