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Finding the Fourth Proportional to 115.41, 172.77 and 80.97

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Solution

The fourth proportional to 115.41, 172.77 and 80.97 is: 121.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.41 : 172.77 = 80.97 : x
  2. Step 2: Convert to fraction form
    115.41/172.77 = 80.97/x
  3. Step 3: Cross multiply
    115.41x = 172.77 × 80.97
  4. Step 4: Simplify right side
    115.41x = 13,989.19
  5. Step 5: Solve for x
    x = 13,989.19/115.41
  6. Step 6: Final answer
    x = 121.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.