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Finding the Fourth Proportional to 172.73, 238.75 and 128.99

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Solution

The fourth proportional to 172.73, 238.75 and 128.99 is: 178.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.73 : 238.75 = 128.99 : x
  2. Step 2: Convert to fraction form
    172.73/238.75 = 128.99/x
  3. Step 3: Cross multiply
    172.73x = 238.75 × 128.99
  4. Step 4: Simplify right side
    172.73x = 30,796.64
  5. Step 5: Solve for x
    x = 30,796.64/172.73
  6. Step 6: Final answer
    x = 178.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.