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Finding the Fourth Proportional to 220.95, 331.11 and 172.80

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Solution

The fourth proportional to 220.95, 331.11 and 172.80 is: 258.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.95 : 331.11 = 172.80 : x
  2. Step 2: Convert to fraction form
    220.95/331.11 = 172.80/x
  3. Step 3: Cross multiply
    220.95x = 331.11 × 172.80
  4. Step 4: Simplify right side
    220.95x = 57,215.81
  5. Step 5: Solve for x
    x = 57,215.81/220.95
  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.