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Finding the Fourth Proportional to 172.48, 258.79 and 69.85

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Solution

The fourth proportional to 172.48, 258.79 and 69.85 is: 104.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.48 : 258.79 = 69.85 : x
  2. Step 2: Convert to fraction form
    172.48/258.79 = 69.85/x
  3. Step 3: Cross multiply
    172.48x = 258.79 × 69.85
  4. Step 4: Simplify right side
    172.48x = 18,077.29
  5. Step 5: Solve for x
    x = 18,077.29/172.48
  6. Step 6: Final answer
    x = 104.81

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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.