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Finding the Third Proportional to 213 and 261.75

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Solution

The third proportional to 213 and 261.75 is: 321.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    213 : 261.75 = 261.75 : x
  2. Step 2: Convert to fraction form
    213/261.75 = 261.75/x
  3. Step 3: Cross multiply
    213x = 261.75 × 261.75
  4. Step 4: Simplify right side
    213x = 68,513.06
  5. Step 5: Solve for x
    x = 68,513.06/213
  6. Step 6: Final answer
    x = 321.66

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Why These Related Problems?

These problems maintain the same ratio (1.23) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.