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Finding the Fourth Proportional to 172.11, 236.97 and 155.91

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Solution

The fourth proportional to 172.11, 236.97 and 155.91 is: 214.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.11 : 236.97 = 155.91 : x
  2. Step 2: Convert to fraction form
    172.11/236.97 = 155.91/x
  3. Step 3: Cross multiply
    172.11x = 236.97 × 155.91
  4. Step 4: Simplify right side
    172.11x = 36,945.99
  5. Step 5: Solve for x
    x = 36,945.99/172.11
  6. Step 6: Final answer
    x = 214.66

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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.