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Finding the Third Proportional to 309.75 and 346.50

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Solution

The third proportional to 309.75 and 346.50 is: 387.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.75 : 346.50 = 346.50 : x
  2. Step 2: Convert to fraction form
    309.75/346.50 = 346.50/x
  3. Step 3: Cross multiply
    309.75x = 346.50 × 346.50
  4. Step 4: Simplify right side
    309.75x = 120,062.25
  5. Step 5: Solve for x
    x = 120,062.25/309.75
  6. Step 6: Final answer
    x = 387.61

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Why These Related Problems?

These problems maintain the same ratio (1.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.