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Finding the Fourth Proportional to 172.53, 238.44 and 129.40

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Solution

The fourth proportional to 172.53, 238.44 and 129.40 is: 178.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.53 : 238.44 = 129.40 : x
  2. Step 2: Convert to fraction form
    172.53/238.44 = 129.40/x
  3. Step 3: Cross multiply
    172.53x = 238.44 × 129.40
  4. Step 4: Simplify right side
    172.53x = 30,854.03
  5. Step 5: Solve for x
    x = 30,854.03/172.53
  6. Step 6: Final answer
    x = 178.83

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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.