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Finding the Fourth Proportional to 172.70, 259.40 and 107.72

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Solution

The fourth proportional to 172.70, 259.40 and 107.72 is: 161.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.70 : 259.40 = 107.72 : x
  2. Step 2: Convert to fraction form
    172.70/259.40 = 107.72/x
  3. Step 3: Cross multiply
    172.70x = 259.40 × 107.72
  4. Step 4: Simplify right side
    172.70x = 27,942.57
  5. Step 5: Solve for x
    x = 27,942.57/172.70
  6. Step 6: Final answer
    x = 161.80

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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.