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Finding the Fourth Proportional to 643.20, 962.64 and 634.56

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Solution

The fourth proportional to 643.20, 962.64 and 634.56 is: 949.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.20 : 962.64 = 634.56 : x
  2. Step 2: Convert to fraction form
    643.20/962.64 = 634.56/x
  3. Step 3: Cross multiply
    643.20x = 962.64 × 634.56
  4. Step 4: Simplify right side
    643.20x = 610,852.84
  5. Step 5: Solve for x
    x = 610,852.84/643.20
  6. Step 6: Final answer
    x = 949.71

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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.