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Finding the Third Proportional to 211.50 and 322.13

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Solution

The third proportional to 211.50 and 322.13 is: 490.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.50 : 322.13 = 322.13 : x
  2. Step 2: Convert to fraction form
    211.50/322.13 = 322.13/x
  3. Step 3: Cross multiply
    211.50x = 322.13 × 322.13
  4. Step 4: Simplify right side
    211.50x = 103,764.52
  5. Step 5: Solve for x
    x = 103,764.52/211.50
  6. Step 6: Final answer
    x = 490.61

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.