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Finding the Fourth Proportional to 643.33, 965.07 and 204.55

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Solution

The fourth proportional to 643.33, 965.07 and 204.55 is: 306.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.33 : 965.07 = 204.55 : x
  2. Step 2: Convert to fraction form
    643.33/965.07 = 204.55/x
  3. Step 3: Cross multiply
    643.33x = 965.07 × 204.55
  4. Step 4: Simplify right side
    643.33x = 197,405.07
  5. Step 5: Solve for x
    x = 197,405.07/643.33
  6. Step 6: Final answer
    x = 306.85

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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.