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Finding the Third Proportional to 217 and 389.75

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Solution

The third proportional to 217 and 389.75 is: 700.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    217 : 389.75 = 389.75 : x
  2. Step 2: Convert to fraction form
    217/389.75 = 389.75/x
  3. Step 3: Cross multiply
    217x = 389.75 × 389.75
  4. Step 4: Simplify right side
    217x = 151,905.06
  5. Step 5: Solve for x
    x = 151,905.06/217
  6. Step 6: Final answer
    x = 700.02

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Why These Related Problems?

These problems maintain the same ratio (1.80) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.