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Finding the Fourth Proportional to 172.77, 259.09 and 81.37

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Solution

The fourth proportional to 172.77, 259.09 and 81.37 is: 122.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.77 : 259.09 = 81.37 : x
  2. Step 2: Convert to fraction form
    172.77/259.09 = 81.37/x
  3. Step 3: Cross multiply
    172.77x = 259.09 × 81.37
  4. Step 4: Simplify right side
    172.77x = 21,082.15
  5. Step 5: Solve for x
    x = 21,082.15/172.77
  6. Step 6: Final answer
    x = 122.02

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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.