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Finding the Fourth Proportional to 643.28, 963.34 and 334.68

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Solution

The fourth proportional to 643.28, 963.34 and 334.68 is: 501.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.28 : 963.34 = 334.68 : x
  2. Step 2: Convert to fraction form
    643.28/963.34 = 334.68/x
  3. Step 3: Cross multiply
    643.28x = 963.34 × 334.68
  4. Step 4: Simplify right side
    643.28x = 322,410.63
  5. Step 5: Solve for x
    x = 322,410.63/643.28
  6. Step 6: Final answer
    x = 501.20

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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.