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Finding the Third Proportional to 143.75 and 305.50

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Solution

The third proportional to 143.75 and 305.50 is: 649.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.75 : 305.50 = 305.50 : x
  2. Step 2: Convert to fraction form
    143.75/305.50 = 305.50/x
  3. Step 3: Cross multiply
    143.75x = 305.50 × 305.50
  4. Step 4: Simplify right side
    143.75x = 93,330.25
  5. Step 5: Solve for x
    x = 93,330.25/143.75
  6. Step 6: Final answer
    x = 649.25

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.