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Finding the Fourth Proportional to 643.05, 963.72 and 350.69

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Solution

The fourth proportional to 643.05, 963.72 and 350.69 is: 525.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.05 : 963.72 = 350.69 : x
  2. Step 2: Convert to fraction form
    643.05/963.72 = 350.69/x
  3. Step 3: Cross multiply
    643.05x = 963.72 × 350.69
  4. Step 4: Simplify right side
    643.05x = 337,962.15
  5. Step 5: Solve for x
    x = 337,962.15/643.05
  6. Step 6: Final answer
    x = 525.56

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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.