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Finding the Fourth Proportional to 172.79, 259.17 and 68.65

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Solution

The fourth proportional to 172.79, 259.17 and 68.65 is: 102.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.79 : 259.17 = 68.65 : x
  2. Step 2: Convert to fraction form
    172.79/259.17 = 68.65/x
  3. Step 3: Cross multiply
    172.79x = 259.17 × 68.65
  4. Step 4: Simplify right side
    172.79x = 17,791.68
  5. Step 5: Solve for x
    x = 17,791.68/172.79
  6. Step 6: Final answer
    x = 102.97

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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.