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Finding the Fourth Proportional to 172.68, 236.39 and 172.11

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Solution

The fourth proportional to 172.68, 236.39 and 172.11 is: 235.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.68 : 236.39 = 172.11 : x
  2. Step 2: Convert to fraction form
    172.68/236.39 = 172.11/x
  3. Step 3: Cross multiply
    172.68x = 236.39 × 172.11
  4. Step 4: Simplify right side
    172.68x = 40,685.51
  5. Step 5: Solve for x
    x = 40,685.51/172.68
  6. Step 6: Final answer
    x = 235.61

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.