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Finding the Third Proportional to 172.13 and 286.31

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Solution

The third proportional to 172.13 and 286.31 is: 476.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.13 : 286.31 = 286.31 : x
  2. Step 2: Convert to fraction form
    172.13/286.31 = 286.31/x
  3. Step 3: Cross multiply
    172.13x = 286.31 × 286.31
  4. Step 4: Simplify right side
    172.13x = 81,974.85
  5. Step 5: Solve for x
    x = 81,974.85/172.13
  6. Step 6: Final answer
    x = 476.25

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Why These Related Problems?

These problems maintain the same ratio (1.66) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.