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Finding the Fourth Proportional to 172.22, 257.73 and 131.40

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Solution

The fourth proportional to 172.22, 257.73 and 131.40 is: 196.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.22 : 257.73 = 131.40 : x
  2. Step 2: Convert to fraction form
    172.22/257.73 = 131.40/x
  3. Step 3: Cross multiply
    172.22x = 257.73 × 131.40
  4. Step 4: Simplify right side
    172.22x = 33,865.72
  5. Step 5: Solve for x
    x = 33,865.72/172.22
  6. Step 6: Final answer
    x = 196.65

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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.