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Finding the Fourth Proportional to 172.45, 238.19 and 137.61

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Solution

The fourth proportional to 172.45, 238.19 and 137.61 is: 190.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.45 : 238.19 = 137.61 : x
  2. Step 2: Convert to fraction form
    172.45/238.19 = 137.61/x
  3. Step 3: Cross multiply
    172.45x = 238.19 × 137.61
  4. Step 4: Simplify right side
    172.45x = 32,777.33
  5. Step 5: Solve for x
    x = 32,777.33/172.45
  6. Step 6: Final answer
    x = 190.07

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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.