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Finding the Third Proportional to 211.50 and 428.63

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Solution

The third proportional to 211.50 and 428.63 is: 868.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.50 : 428.63 = 428.63 : x
  2. Step 2: Convert to fraction form
    211.50/428.63 = 428.63/x
  3. Step 3: Cross multiply
    211.50x = 428.63 × 428.63
  4. Step 4: Simplify right side
    211.50x = 183,719.39
  5. Step 5: Solve for x
    x = 183,719.39/211.50
  6. Step 6: Final answer
    x = 868.65

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Why These Related Problems?

These problems maintain the same ratio (2.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.