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Finding the Third Proportional to 217.69 and 306.28

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Solution

The third proportional to 217.69 and 306.28 is: 430.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.69 : 306.28 = 306.28 : x
  2. Step 2: Convert to fraction form
    217.69/306.28 = 306.28/x
  3. Step 3: Cross multiply
    217.69x = 306.28 × 306.28
  4. Step 4: Simplify right side
    217.69x = 93,808.20
  5. Step 5: Solve for x
    x = 93,808.20/217.69
  6. Step 6: Final answer
    x = 430.93

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.