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Finding the Third Proportional to 213.66 and 306.56

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Solution

The third proportional to 213.66 and 306.56 is: 439.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.66 : 306.56 = 306.56 : x
  2. Step 2: Convert to fraction form
    213.66/306.56 = 306.56/x
  3. Step 3: Cross multiply
    213.66x = 306.56 × 306.56
  4. Step 4: Simplify right side
    213.66x = 93,980.57
  5. Step 5: Solve for x
    x = 93,980.57/213.66
  6. Step 6: Final answer
    x = 439.87

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.