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Finding the Third Proportional to 305.75 and 435.50

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Solution

The third proportional to 305.75 and 435.50 is: 620.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.75 : 435.50 = 435.50 : x
  2. Step 2: Convert to fraction form
    305.75/435.50 = 435.50/x
  3. Step 3: Cross multiply
    305.75x = 435.50 × 435.50
  4. Step 4: Simplify right side
    305.75x = 189,660.25
  5. Step 5: Solve for x
    x = 189,660.25/305.75
  6. Step 6: Final answer
    x = 620.31

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.