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Finding the Third Proportional to 172.31 and 260.91

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Solution

The third proportional to 172.31 and 260.91 is: 395.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.31 : 260.91 = 260.91 : x
  2. Step 2: Convert to fraction form
    172.31/260.91 = 260.91/x
  3. Step 3: Cross multiply
    172.31x = 260.91 × 260.91
  4. Step 4: Simplify right side
    172.31x = 68,072.07
  5. Step 5: Solve for x
    x = 68,072.07/172.31
  6. Step 6: Final answer
    x = 395.05

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.