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Finding the Third Proportional to 380.75 and 430.75

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Solution

The third proportional to 380.75 and 430.75 is: 487.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.75 : 430.75 = 430.75 : x
  2. Step 2: Convert to fraction form
    380.75/430.75 = 430.75/x
  3. Step 3: Cross multiply
    380.75x = 430.75 × 430.75
  4. Step 4: Simplify right side
    380.75x = 185,545.56
  5. Step 5: Solve for x
    x = 185,545.56/380.75
  6. Step 6: Final answer
    x = 487.32

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Why These Related Problems?

These problems maintain the same ratio (1.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.