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Finding the Fourth Proportional to 220.72, 329.78 and 172.66

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Solution

The fourth proportional to 220.72, 329.78 and 172.66 is: 257.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.72 : 329.78 = 172.66 : x
  2. Step 2: Convert to fraction form
    220.72/329.78 = 172.66/x
  3. Step 3: Cross multiply
    220.72x = 329.78 × 172.66
  4. Step 4: Simplify right side
    220.72x = 56,939.81
  5. Step 5: Solve for x
    x = 56,939.81/220.72
  6. Step 6: Final answer
    x = 257.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.