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Finding the Fourth Proportional to 220.68, 331.56 and 207.72

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Solution

The fourth proportional to 220.68, 331.56 and 207.72 is: 312.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.68 : 331.56 = 207.72 : x
  2. Step 2: Convert to fraction form
    220.68/331.56 = 207.72/x
  3. Step 3: Cross multiply
    220.68x = 331.56 × 207.72
  4. Step 4: Simplify right side
    220.68x = 68,871.64
  5. Step 5: Solve for x
    x = 68,871.64/220.68
  6. Step 6: Final answer
    x = 312.09

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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.