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Finding the Fourth Proportional to 172.85, 238.43 and 129.11

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Solution

The fourth proportional to 172.85, 238.43 and 129.11 is: 178.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.85 : 238.43 = 129.11 : x
  2. Step 2: Convert to fraction form
    172.85/238.43 = 129.11/x
  3. Step 3: Cross multiply
    172.85x = 238.43 × 129.11
  4. Step 4: Simplify right side
    172.85x = 30,781.86
  5. Step 5: Solve for x
    x = 30,781.86/172.85
  6. Step 6: Final answer
    x = 178.09

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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.