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Finding the Fourth Proportional to 220.34, 329.90 and 172.96

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Solution

The fourth proportional to 220.34, 329.90 and 172.96 is: 258.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.34 : 329.90 = 172.96 : x
  2. Step 2: Convert to fraction form
    220.34/329.90 = 172.96/x
  3. Step 3: Cross multiply
    220.34x = 329.90 × 172.96
  4. Step 4: Simplify right side
    220.34x = 57,057.81
  5. Step 5: Solve for x
    x = 57,057.81/220.34
  6. Step 6: Final answer
    x = 258.95

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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.