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Finding the Third Proportional to 215 and 286

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Solution

The third proportional to 215 and 286 is: 380.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    215 : 286 = 286 : x
  2. Step 2: Convert to fraction form
    215/286 = 286/x
  3. Step 3: Cross multiply
    215x = 286 × 286
  4. Step 4: Simplify right side
    215x = 81,796
  5. Step 5: Solve for x
    x = 81,796/215
  6. Step 6: Final answer
    x = 380.45

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These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.