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Finding the Fourth Proportional to 644.25, 963.95 and 399.63

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Solution

The fourth proportional to 644.25, 963.95 and 399.63 is: 597.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.25 : 963.95 = 399.63 : x
  2. Step 2: Convert to fraction form
    644.25/963.95 = 399.63/x
  3. Step 3: Cross multiply
    644.25x = 963.95 × 399.63
  4. Step 4: Simplify right side
    644.25x = 385,221.34
  5. Step 5: Solve for x
    x = 385,221.34/644.25
  6. Step 6: Final answer
    x = 597.94

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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.