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Finding the Fourth Proportional to 644.01, 963.48 and 639.33

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Solution

The fourth proportional to 644.01, 963.48 and 639.33 is: 956.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.01 : 963.48 = 639.33 : x
  2. Step 2: Convert to fraction form
    644.01/963.48 = 639.33/x
  3. Step 3: Cross multiply
    644.01x = 963.48 × 639.33
  4. Step 4: Simplify right side
    644.01x = 615,981.67
  5. Step 5: Solve for x
    x = 615,981.67/644.01
  6. Step 6: Final answer
    x = 956.48

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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.