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Finding the Third Proportional to 211.25 and 309.50

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Solution

The third proportional to 211.25 and 309.50 is: 453.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.25 : 309.50 = 309.50 : x
  2. Step 2: Convert to fraction form
    211.25/309.50 = 309.50/x
  3. Step 3: Cross multiply
    211.25x = 309.50 × 309.50
  4. Step 4: Simplify right side
    211.25x = 95,790.25
  5. Step 5: Solve for x
    x = 95,790.25/211.25
  6. Step 6: Final answer
    x = 453.44

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.