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Finding the Third Proportional to 289 and 315.50

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Solution

The third proportional to 289 and 315.50 is: 344.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    289 : 315.50 = 315.50 : x
  2. Step 2: Convert to fraction form
    289/315.50 = 315.50/x
  3. Step 3: Cross multiply
    289x = 315.50 × 315.50
  4. Step 4: Simplify right side
    289x = 99,540.25
  5. Step 5: Solve for x
    x = 99,540.25/289
  6. Step 6: Final answer
    x = 344.43

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.