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Finding the Fourth Proportional to 643.46, 965.09 and 273.15

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Solution

The fourth proportional to 643.46, 965.09 and 273.15 is: 409.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.46 : 965.09 = 273.15 : x
  2. Step 2: Convert to fraction form
    643.46/965.09 = 273.15/x
  3. Step 3: Cross multiply
    643.46x = 965.09 × 273.15
  4. Step 4: Simplify right side
    643.46x = 263,612.97
  5. Step 5: Solve for x
    x = 263,612.97/643.46
  6. Step 6: Final answer
    x = 409.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.