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Finding the Fourth Proportional to 172.67, 238.09 and 128.93

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Solution

The fourth proportional to 172.67, 238.09 and 128.93 is: 177.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.67 : 238.09 = 128.93 : x
  2. Step 2: Convert to fraction form
    172.67/238.09 = 128.93/x
  3. Step 3: Cross multiply
    172.67x = 238.09 × 128.93
  4. Step 4: Simplify right side
    172.67x = 30,696.30
  5. Step 5: Solve for x
    x = 30,696.30/172.67
  6. Step 6: Final answer
    x = 177.77

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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.