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Finding the Fourth Proportional to 172.63, 238.19 and 131.12

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Solution

The fourth proportional to 172.63, 238.19 and 131.12 is: 180.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.63 : 238.19 = 131.12 : x
  2. Step 2: Convert to fraction form
    172.63/238.19 = 131.12/x
  3. Step 3: Cross multiply
    172.63x = 238.19 × 131.12
  4. Step 4: Simplify right side
    172.63x = 31,231.26
  5. Step 5: Solve for x
    x = 31,231.26/172.63
  6. Step 6: Final answer
    x = 180.91

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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.