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Finding the Fourth Proportional to 172.88, 259.42 and 76.68

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Solution

The fourth proportional to 172.88, 259.42 and 76.68 is: 115.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.88 : 259.42 = 76.68 : x
  2. Step 2: Convert to fraction form
    172.88/259.42 = 76.68/x
  3. Step 3: Cross multiply
    172.88x = 259.42 × 76.68
  4. Step 4: Simplify right side
    172.88x = 19,892.33
  5. Step 5: Solve for x
    x = 19,892.33/172.88
  6. Step 6: Final answer
    x = 115.06

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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.