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Finding the Fourth Proportional to 172.89, 236.78 and 162.91

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Solution

The fourth proportional to 172.89, 236.78 and 162.91 is: 223.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.89 : 236.78 = 162.91 : x
  2. Step 2: Convert to fraction form
    172.89/236.78 = 162.91/x
  3. Step 3: Cross multiply
    172.89x = 236.78 × 162.91
  4. Step 4: Simplify right side
    172.89x = 38,573.83
  5. Step 5: Solve for x
    x = 38,573.83/172.89
  6. Step 6: Final answer
    x = 223.11

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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.